Sake

. Momoyama period, 16th century. Until the Kamakura period The origin of sake is unclear; however, the method of fermenting rice into alcohol spread to Japan from China around 500 BCE. The earliest reference to the use of alcohol in Japan is recorded in the Book of Wei in the Records of the Three Kingdoms. This 3rd-century Chinese text speaks of Japanese drinking and dancing. are mentioned several times in the , Japan's first written history, which was compiled in 712. Bamforth (2005) places the probable origin of true sake (which is made from rice, water, and ) in the Nara period (710–794). The fermented food fungi traditionally used for making alcoholic beverages in China and Korea for a long time were fungi belonging to Rhizopus and Mucor, whereas in Japan, except in the early days, the fermented food fungus used for sake brewing was Aspergillus oryzae. A large tub with a capacity of 10 koku (1,800 liters) was invented at the end of the Muromachi period, making it possible to mass-produce sake more efficiently than before. Until then, sake had been made in jars with a capacity of 1, 2, or 3 koku at the most, and some sake brewers used to make sake by arranging 100 jars. In the 16th century, the technique of distillation was introduced into the Kyushu district from Ryukyu. The Nada-Gogō area in Hyōgo Prefecture, the largest producer of modern sake, was formed during this period. When the population of Edo, modern-day Tokyo, began to grow rapidly in the early 1600s, brewers who made sake in inland areas such as Fushimi, Itami, and Ikeda moved to the Nada-Gogō area on the coast, where the weather and water quality were perfect for brewing sake and convenient for shipping it to Edo. In the Genroku era, when the culture of the chōnin class, the common people, prospered, the consumption of sake increased rapidly, and large quantities of were shipped to Edo. 80% of the sake drunk in Edo during this period was from Nada-Gogō. Many of today's major sake producers, including Hakutsuru, Ōzeki, Nihonsakari, Kikumasamune, Kenbishi and Sawanotsuru, are breweries in Nada-Gogō. The #Methods of preparing the starter mash| method, one of the traditional techniques for preparing the starter mash, was developed in the Nada during the Edo period. During this period, frequent natural disasters and bad weather caused rice shortages, and the Tokugawa shogunate issued sake brewing restrictions 61 times. In the early Edo period, there was a sake brewing technique called that was optimized for each season. In 1667, the technique of for making sake in winter was improved, and in 1673, when the Tokugawa shogunate banned brewing other than kanzukuri because of a shortage of rice, the technique of sake brewing in the four seasons ceased, and it became common to make sake only in winter until industrial technology began to develop in the 20th century. During this period, aged for three, five, or nine years, was a luxury, but its deliciousness was known to the common people. and Isaac Titsingh published accounts identifying sake as a popular alcoholic beverage in Japan, but Titsingh was the first to try to explain and describe the process of sake brewing. The work of both writers was widely disseminated throughout Europe at the beginning of the 19th century. From the Meiji era to the early Shōwa era Starting around the beginning of the Meiji era (1868–1912), the technique for making sake began to develop rapidly. Breeding was actively carried out in various parts of Japan to produce sake rice optimized for sake brewing. Ise Nishiki developed in 1860, Omachi developed in 1866 and Shinriki developed in 1877 are the earliest representative varieties. In 1923, Yamada Nishiki, later called the "king of sake rice," was produced. In Japan, sake has long been taxed by the national government. In 1878, the liquor tax accounted for 12.3% of the national tax revenue, excluding local taxes, and in 1888 it was 26.4%, and in 1899 it was 38.8%, finally surpassing the land tax of 35.6%. The Meiji government adopted a system in which taxes were collected when sake was finished, instead of levying taxes on the amount and price of sake at the time of sale to ensure more revenue from liquor taxes. The liquor tax for the sake produced in a given year had to be paid to the government during that fiscal year, so the breweries tried to make money by selling the sake as soon as possible. This destroyed the market for aged , which had been popular until then, and it was only in 1955 that sake breweries began to make again. Since the mid-Showa era After the war, the breweries gradually recovered and the quality of sake steadily improved, and there were various innovations in sake brewing. The term , which means carefully brewed sake, first appeared at the end of the Edo period, and the term , which has the same meaning, first appeared in 1894. However, , which is popular in the world today, was created by the development of various sake production techniques from the 1930s to around 1975. From 1930 to 1931, a new type of rice milling machine was invented, which made it possible to make rice with a polishing ratio of about 50%, removing the miscellaneous taste derived from the surface part of the rice grain to make sake with a more aromatic and refreshing taste than before. In 1936, Yamada Nishiki, the most suitable sake rice for brewing ginjō-shu, became the recommended variety of Hyogo Prefecture. Around 1953, the , was invented, which produced fruit-like aromas like apples and bananas but also excelled in fermentation. From around 1965, more and more manufacturers began to work on the research and development of ginjō-shu, and by about 1968, the Kyokai yeast No. 9 began to be used throughout Japan. In the 1970s, temperature control technology in the mash production process improved dramatically. And by slowly fermenting rice at low temperatures using high-milled rice and a newly developed sake yeast, ginjō-shu with a fruity flavor was created. At that time, ginjō-shu was a special sake exhibited at competitive exhibitions and was not on the market. From around 1975, ginjō-shu began to be marketed and was widely distributed in the 1980s, and in 1990, with the definition of what can be labeled as ginjō-shu, more and more brewers began to sell ginjō-shu. The growing popularity of ginjō-shu has prompted research into yeast, and many yeasts with various aromas optimized for ginjō-shu have been developed. In 1973, the National Tax Agency's brewing research institute developed . The number of sake breweries is also declining. While there were 3,229 breweries nationwide in fiscal 1975, the number had fallen to 1,845 in 2007. In recent years, exports have rapidly increased due to the growing popularity of sake worldwide. The value of sake exports in 2022 was more than six times that of 2009. As of 2022, the value of Japan's alcoholic beverage exports was approximately 139.2 billion yen, with Japanese whisky in first place at 56.1 billion yen and sake in second place at 47.5 billion yen. Today, sake has become a world beverage with a few breweries in China, Southeast Asia, South America, North America, and Australia. In addition to Aspergillus oryzae (yellow kōji), Aspergillus kawachii (white kōji) and Aspergillus luchuensis (black kōji), which are used to brew shōchū and awamori, have been used to brew sake since the 21st century. More breweries are also turning to older methods of production. For example, since the 21st century, the use of wooden tubs has increased again due to the development of sanitary techniques. The use of wooden tubs for fermentation has the advantage of allowing various microorganisms living in the wood to affect sake, allowing more complex fermentation and producing sake with different characteristics. It is also known that the antioxidants contained in wood have a positive effect on sake. In December 2024, sake brewing (not sake itself) was recognized by UNESCO as an intangible cultural heritage. Oldest sake brewery The oldest sake brewing company still in operation, as confirmed by historical documents, is the Sudo Honke in Kasama, Ibaraki, founded in 1141 during the Heian period (794–1185). Sudō Honke was also the first sake brewery to sell both namazake and hiyaoroshi. Hiyaoroshi refers to sake that is finished in winter, pasteurized once in early spring, stored and aged for a little while during the summer, and shipped in the fall without being pasteurized a second time. In terms of excavated archaeological evidence, the oldest known sake brewery is from the 15th century near an area that was owned by Tenryū-ji, in Ukyō-ku, Kyoto. Unrefined sake was squeezed out at the brewery, and there are about 180 holes (60 cm wide, 20 cm deep) for holding storage jars. A hollow (1.8 meter wide, 1 meter deep) for a pot to collect drops of pressed sake and 14th-century Bizen ware jars were also found. It is estimated to be utilized until the Ōnin War (1467–1477). Sake was brewed at Tenryū-ji during the Muromachi period (1336–1573). ==Production==

, with a sugidama globe of cedar leaves indicating new sake Rice The rice used for brewing sake is called , or officially . There are at least 123 types of sake rice in Japan. Among these, Yamada Nishiki, Gohyakumangoku, Miyama Nishiki and Omachi rice are popular. Premium sake is mostly made from sake rice. However, non-premium sake is mostly made from table rice. According to the Japan Sake and Shochu Makers Association, premium sake makes up 25% of total sake production, and non-premium sake () makes up 75% of sake production. In 2008, a total of 180,000 tons of polished rice were used in sake brewing, of which sake rice accounted for 44,000 tons (24%), and table rice accounted for 136,000 tons (76%). Sake rice is usually polished to a much higher degree than ordinary table rice. The reason for polishing is a result of the composition and structure of the rice grain itself. The core of the rice grain is rich in starch, while the outer layers of the grain contain higher concentrations of fats, vitamins, and proteins. Since a higher concentration of fat and protein in the sake would lead to off-flavors and contribute rough elements to the sake, the outer layers of the sake rice grain is milled away in a polishing process, leaving only the starchy part of the grain (some sake brewers remove over 60% of the rice grain in the polishing process). That desirable pocket of starch in the center of the grain is called the . It usually takes two to three days to polish rice down to less than half its original size. The rice powder by-product of polishing is often used for making rice crackers, Japanese sweets (i.e. Dango), and other food stuffs. As of 2023, the most polished sake has a polishing ratio of 0.85% or less, with at least 99.15% of its rice grains polished away. This sake is , released by , priced at 1,375,000 yen for 720 ml. Water Water is involved in almost every major sake brewing process, from washing the rice to diluting the final product before bottling. The mineral content of the water can be important in the final product. Iron will bond with an amino acid produced by the to produce off flavors and a yellowish color. Manganese, when exposed to ultraviolet light, will also contribute to discoloration. Conversely, potassium, magnesium, and phosphoric acid serve as nutrients for sake yeast during fermentation and are considered desirable. The yeast will use those nutrients to work faster and multiply resulting in more sugar being converted into alcohol. While soft water will typically yield sweeter sake, hard water with a higher mineral content is known for producing drier-style sake. The first region known for having great water was the Nada-Gogō in Hyōgo Prefecture. A particular water source called was found to produce high-quality sake and attracted many producers to the region. Typically breweries obtain water from wells, though surface water can be used. Breweries may use tap water and filter and adjust components. In Japan, A. oryzae is used to make various fermented foods, including miso (a paste made from soybeans) and (soy sauce). Under warm and moist conditions, the A. oryzae spores germinate and release amylases (enzymes that convert the rice starches into maltose and glucose). This conversion of starch into simple sugars (e.g., glucose or maltose) is called saccharification. Yeast then ferment the glucose and other sugar into alcohol. In these cases the animals infected with A. oryzae were already weakened due to predisposing conditions such as recent injury, illness or stress, hence were susceptible to infections in general. From the 1980s, research was conducted to brew sake using Aspergillus kawachii (white kōji), which is used to make shōchū, and sake made with Aspergillus kawachii became popular when Aramasa Co, Ltd. released "Amaneko" using Aspergillus kawachii in 2009. Aspergillus kawachii produces about 10 times more citric acid than Aspergillus oryzae, and thus has a strong ability to suppress the growth of bacteria that damage the flavor of sake. It also imparts a sour, citrus-like flavor to sake. Because it produces so much citric acid, older sake-making methods such as kimoto or yamahai can produce a starter mash as quickly as modern sokujō. Kimoto and yamahai do not add artificial lactic acid, which allows them to be labeled "additive-free," giving them a marketing advantage when exporting. The various types of yeast used in sake brewing belong to the species Saccharomyces cerevisiae, and a large number of yeasts have been developed in Japan. Before the modernization of Japan, breweries used yeasts that were native to each brewery. The yeasts evolved uniquely in each brewery as they competed for survival by mixing with microorganisms that became airborne and attached to the human body during the sake brewing process. Because some of these yeasts were not suitable for brewing sake, the quality of sake varied from brewery to brewery and from period to period. In 1895, Dr. Kikuji Yabe isolated the first Saccharomyces sake yeast suitable for brewing sake. In 1904, the government established the National Brewing Laboratory and began detailed studies of yeast. In 1906, the Brewing Society of Japan was founded, and a system was established whereby any superior yeast discovered was registered as Kyokai-kōbo ("Kyokai yeast", "Association yeast") and distributed to breweries throughout Japan. Kyokai yeast No. 7 and No. 9 are particularly popular. In response to the popularity of ginjō-shu since the 1980s, various aromatic yeasts have been developed. Today, the Brewing Society of Japan, research institutes in each prefecture, and breweries continue to develop a variety of yeasts, and an increasing number of breweries are making sake from yeasts found in flowers. Fermentation Sake fermentation is a three-step process called . On the second day, the mixture stands for a day to let the yeast multiply. After the fermentation process is complete, the fermented is pressed to remove the sake lees and then pasteurized and filtered for color. On the other hand, ginjō-shu takes about 30 days for fermentation alone. Tōji is the job title of the sake brewer. There are various theories about the origin of the word, but the most popular is that it is a corruption of the word , which was used for housewives and elderly women who supervised miko (shrine maidens). This is because sake brewing was the work of housewives at home and miko at Shinto shrines. It is a highly respected job in the Japanese society, with being regarded like musicians or painters. The title of was historically passed from father to son. Today new are either veteran brewery workers or are trained at universities. While modern breweries with cooling tanks operate year-round, most old-fashioned sake breweries are seasonal, operating only in the cool winter months. During the summer and fall, most work elsewhere, commonly on farms, only periodically returning to the brewery to supervise storage conditions or bottling operations. ==Varieties==

Special-designation sake There are two basic types of sake: and . is the equivalent of table wine and accounts for 57% of sake production as of 2020. refers to premium sake distinguished by the degree to which the rice has been polished and the added percentage of brewer's alcohol or the absence of such additives. There are eight varieties of special-designation sake. is sake made using a special method called , in which rice is slowly fermented for about 30 days at a low temperature of 5 to 10 degrees Celsius (41 to 50 degrees Fahrenheit). is a term used for the sake that is made of pure rice wine without any additional distilled alcohol. Special-designation sake which is not labeled has an appropriate amount of distilled alcohol added. The maximum amount of distilled alcohol added to is 50% of the rice weight, mainly to increase the volume, while the maximum amount of distilled alcohol added to special-designation sake is 10% of the rice weight, to make the sake more aromatic and light in taste, and to prevent the growth of lactic acid bacteria, which deteriorate the flavor of the sake. However, the most important aspect of the contest is the brewing technique, not whether it tastes good or not. Sake made with highly milled rice has a strong aroma and a light taste without miscellaneous taste. It maximizes the fruity flavor of ginjō. On the other hand, sake made with less milled rice but with attention to various factors tends to have a rich sweetness and flavor derived from rice. In recent years, some sake breweries have begun to revive this method based on documents from the Muromachi period. • is a method of making starter mash that was developed in the Nada during the Edo period. • is undiluted sake. Most sake is diluted with water after brewing to lower the alcohol content from 18 to 20% down to 14–16%, but is not. • means unfiltered. It refers to sake that has not been carbon filtered but that has been pressed and separated from the lees and thus is clear, not cloudy. Carbon filtration can remove desirable flavors and odors as well as bad ones, thus sake has stronger flavors than filtered varieties. • is sake made by squeezing mash and putting the freshly made sake directly into a bottle without transferring it to a tank. It is generally effervescent and has a strong flavor because it is filled in the bottle with as little exposure to the air as possible to the freshest liquor that continues to ferment. It is a sake that maximizes the advantages of or . • is cloudy sake. The sake is passed through a loose mesh to separate it from the mash. In the production process of , rough cloth or colander is used to separate mash. It is not filtered after that, and there is much rice sediment in the bottle. It is generally characterized by its rich sweetness derived from rice. Nigorizake is sometimes unpasteurized namazake, which means that it is still fermenting and has an effervescent quality. Therefore, shaking the bottle or exposing it to high temperatures may cause the sake to spurt out of the bottle, so care should be taken when opening the bottle. When first opening the bottle, the cap should be slightly opened and then closed repeatedly to release the gas that has filled the bottle little by little. To maximize the flavor of nigorizake, there are some tips on how to drink it. First drink only the clear supernatant, then close the cap and slowly turn the bottle upside down to mix the sediment with the clear sake to enjoy the change in flavor. • is a sake with less turbidity than . is filtered differently from and is filtered in the same way as ordinary sake. The reason mash lees are precipitated in the bottle is that the process of making ordinary sake, in which lees are precipitated and the supernatant is scooped up and bottled to complete the product, is omitted. Sake that is lightly cloudy like is also called or . • is the Japanese legal definition of sake and refers to sake in which the solids have been strained out, leaving clear liquid. Thus (see below) is not and therefore are not actually sake under Japanese law. Although is cloudy, it is legally classified as because it goes through the process of filtering through a mesh. • is 'aged sake'. Most sake does not age well, but this specially made type can age for decades, turning yellow and acquiring a honeyed flavor. • is sake aged in wooden barrels or bottled in wooden casks. The wood used is , which is also known as Japanese cedar. Sake casks are often tapped ceremonially to open buildings, businesses, parties, etc. Because the wood imparts a strong flavor, premium sake is rarely used for this type. • refers to sake that has been shipped without the traditional six-month aging/maturation period. The result is usually a more acidic, "greener" sake. • is a method of separating sake from the lees without external pressure by hanging the mash in bags and allowing the liquid to drip out under its weight. Sake produced this way is sometimes called . • is sake pressed into bottles () with the brewer selecting the best sake of the batch for shipping. Others • is a traditional sweet, low- or non-alcoholic Japanese drink made from fermented rice. • is the classic home-brew style of sake (although home brewing is illegal in Japan). It is created by simply adding mold to steamed rice and water and letting the mixture ferment. It is sake made without separating mash. The resulting sake is somewhat like a chunkier version of . • '''''' () is locally brewed sake, the equivalent of microbrewing beer. • is sake made using sake instead of water. A typical sake is made using 130 liters of water for every 100 kilograms of rice, while kijōshu is made using 70 liters of water and 60 liters of sake for every 100 kilograms of rice. Kijōshu is characterized by its unique rich sweetness, aroma and thickness, which can be best brought out when aged to an amber color. kijōshu is often more expensive than ordinary sake because it was developed in 1973 by the National Tax Agency's brewing research institute for the purpose of making expensive sake that can be served at government banquets for state guests. The method of making sake using sake instead of water is similar to the sake brewing method called shiori described in the Engishiki compiled in 927. Because the term kijōshu is trademarked, sake makers not affiliated with the cannot use the name. Therefore, when non-member sake manufacturers sell kijōshu, they use terms such as to describe the process. • is sake made from unpolished rice (i.e., brown rice), and is more like huangjiu. • is sake with a deliberately high rice-polishing ratio. It is generally held that the lower the rice polishing ratio (the percent weight after polishing), the better the potential of the sake. Circa 2005, has been produced as a specialty sake made with high rice-polishing ratios, usually around 80%, to produce sake with the characteristic flavor of rice itself. • , literally "red sake", is produced by using red yeast rice , giving the sake a pink-tinted appearance similar to rosé wine. Some other terms commonly used in connection with sake: • , also called the Sake Meter Value or SMV ::\text{SMV} = \left( \left| \frac{1}\text{specific gravity} \right| - 1 \right) \times 1443 :Specific gravity is measured on a scale weighing the same volume of water at and sake at . The sweeter the sake, the lower the number (or more negative); the drier the sake, the higher the number. When the SMV was first used, 0 was the point between sweet and dry sake. Now +3 is considered neutral. • is the rice polishing ratio (or milling rate), the percentage of weight remaining after polishing. Generally, the lower the number, the higher the sake's complexity. A lower percentage usually results in a fruitier and more complex sake, whereas a higher percentage will taste more like rice. • are pressed sake lees, the solids left after pressing and filtering. These are used for making pickles, livestock feed, and shōchū, and as an ingredient in dishes like kasu soup. ==Craft sake==

as a secondary ingredient, the one in the middle with hops, and the one on the right with coffee. In Japan, is sake that is brewed based on sake production techniques, but produced in a manner that differs from the traditional sake production process as defined by the . It is classified as rather than under the Liquor Tax Law, but is generally recognized as sake. The Liquor Tax Law definition does not allow sake to be made with secondary ingredients, but since craft sake is not bound by the Liquor Tax Law definition, fruits and herbs are often used as secondary ingredients. It can achieve a different flavor from conventional sake by using secondary ingredients, and can use local products from the brewery's area as secondary ingredients. For example, the Ine to Agave Brewery uses agave, hops, apples, grapes, matcha, honey, coffee, etc. as secondary ingredients. In Japan, the Liquor Tax Law prohibits new entrants from obtaining a new sake brewing license to sell sake in Japan. If a new entrant wants to start brewing sake, it must either take over an existing brewery or produce sake for export only. Therefore, young entrepreneurs who want to make sake tend to start making craft sake, which is easier to enter. The Japan Craft Sake Breweries Association was founded in 2022 under the leadership of Shuhei Okazumi of Ine to Agave Brewery. The association hopes to appeal to young people and women who have not been frequent sake drinkers, and due to the high added value, many craft sake are priced at about twice the price of traditional sake. ==Taste and flavor==

Reading the label The label on a bottle of sake gives a rough indication of its taste. Terms found on the label may include , , and . or Sake Meter Value (SMV) is calculated from the specific gravity of the sake and indicates the sugar and alcohol content of the sake on an arbitrary scale. Typical values are between −3 (sweet) and +10 (dry), equivalent to specific gravities ranging between 1.007 and 0.998, though the maximum range of can go much beyond that. The must be considered together with to determine the overall perception of dryness-sweetness, richness-lightness characteristics of a sake (for example, a higher level of acidity can make a sweet sake taste drier than it actually is). indicates the concentration of acid, which is determined by titration with sodium hydroxide solution. This number equals the milliliters of titrant required to neutralize the acid in of sake. In addition to apples and bananas, other fruits mentioned as flavor notes for fruity sake, especially ginjō-shu, include melons, grapes, peaches, pineapples, citrus, etc. ==Serving sake==

In Japan, sake is served , at , or , depending on the preference of the drinker, the characteristics of the sake, and the season. Typically, hot sake is a winter drink, and high-grade sake is not usually drunk hot because the flavors and aromas may be lost. Most lower-quality sake is served hot because that is the traditional way, and it often tastes better that way, not so that flaws are covered up. There are gradations of temperature both for chilling and heating, about every , with hot sake generally served around , and chilled sake around , like white wine. may be reheated. Sake is traditionally drunk from small cups called or and poured into the from ceramic flasks called . This is very common for hot sake, where the flask is heated in hot water, and the small cups ensure that the sake does not get cold in the cup, but it may also be used for chilled sake. Traditionally one does not pour one's own drink, which is known as , but instead members of a party pour for each other, which is known as . This has relaxed in recent years but is generally observed on more formal occasions, such as business meals, and is still often observed for the first drink. Another traditional cup is the masu, a box usually made of hinoki or sugi, which was originally used for measuring rice. The holds exactly one gō, , so the sake is served by filling the to the brim; this is done for chilled or room temperature sake. In some Japanese restaurants, as a show of generosity, the server may put a glass inside the or put the on a saucer and pour until sake overflows and fills both containers. Sake is traditionally served in units of , and this is still common, but other sizes are sometimes also available. Saucer-like cups called are also used, most commonly at weddings and other ceremonial occasions, such as the start of the year or the beginning of a kaiseki meal. In cheap bars, sake is often served at room temperature in glass tumblers and called . In more modern restaurants, wine glasses are also used, and recently footed glasses made specifically for premium sake have also come into use. Traditionally sake is heated immediately before serving, but today restaurants may buy sake in boxes that can be heated in a specialized hot sake dispenser, thus allowing hot sake to be served immediately. However, this is detrimental to the flavor. There are also a variety of devices for heating sake and keeping it warm beyond the traditional . Aside from being served straight, sake can be used as a mixer for cocktails, such as tamagozake, saketinis, or nogasake. Outside of Japan, the sake bomb, the origins of which are unclear, has become a popular drink in bars and Asia-themed karaoke clubs. The Japanese Sake Association encourages people to drink chaser water for their health, and the water is called Yawaragi-mizu. ==Seasonality==

Because the cooler temperatures make it more difficult for bacteria to grow, sake brewing traditionally took place mainly in winter, and this was especially true from 1673 during the Edo period until the early 20th century during the Showa era. While it can now be brewed year-round, seasonality is still associated with sake, particularly artisanal ones. The most visible symbol of this is the , a globe of cedar leaves traditionally hung outside a brewery when the new sake is brewed. The leaves start green but turn brown over time, reflecting the maturation of the sake. These are now hung outside many restaurants serving sake. The new year's sake is called , and when initially released in late winter or early spring, many brewers have a celebration known as . Traditionally sake was best transported in the cool spring to avoid spoilage in the summer heat, with a secondary transport in autumn, once the weather had cooled, known as —this autumn sake has matured over the summer. ==Storage==

Sake is sold in volume units divisible by (one gō), the traditional Japanese unit for cup size. Sake is traditionally sold by the -sized cup, or in a (one shō or ten )-sized flask (called an , or 'one shō-measure bottle'). Today sake is also often sold in bottles, which are divisible into four . Note that this is almost the same as the standard for wine bottles, which is divisible into four quarter bottles (187ml). Particularly in convenience stores, sake (generally of cheap quality) may be sold in a small bottle or a single serving (one gō) . Generally, it is best to keep sake refrigerated in a cool or dark room, as prolonged exposure to heat or direct light will lead to spoilage. Sake stored at a relatively high temperature can lead to the formation of diketopiperazine, a cyclo (Pro-Leu) that makes it bitter as it ages. Sake has high microbiological stability due to its high content of ethanol, but instances of spoilage have occurred. One of the microorganisms implicated in this spoilage is lactic acid bacteria (LAB) that has grown tolerant to ethanol and is referred to as -bacteria. Sake stored at room temperature is best consumed within a few months after purchase. Sake can be stored for a long time due to its high alcohol content and has no use-by dates written on the bottle or label. However, there is a best before date for good drinking, and it depends on the type of sake, with the typical twice-pasteurized sake having a relatively long best before date. According to major sake brewer Gekkeikan, the best before date when unopened and stored in a dark place at about 20 degrees Celsius (68 degrees Fahrenheit) is one year after production for futsū-shu and honjōzō-shu, 10 months for ginjō-shu, junmai-shu, and sake pasteurized only once, and up to eight months for special namazake that can be distributed at room temperature. According to Sawanotsuru, once pasteurized sake and unpasteurized namazake have a best before date of nine months after production. Some sources also state that the best before date for unpasteurized namazake is three to six months after production. Namazake generally requires refrigeration at all times. However, there are exceptions to these storage conditions, in which case the conditions are stated on the label. For example, sake under the brand name must be kept refrigerated at all times, even if it is junmai-shu, which has been pasteurized. Once the sake is opened, it should be kept refrigerated, as the flavor deteriorates more quickly than before opening. Best before date after opening the bottle varies depending on the source. According to sake media outlet Sake no shizuku, which interviewed several major sake production companies, the responses from all companies were nearly identical. According to the responses, junmai type sake without added distilled alcohol has a best before date of 10 days after opening, while other types of sake with added distilled alcohol has a best before date of one month after opening. According to the international sommelier of sake certified by SSI International, ginjō type sake, which is fermented at low temperature for a long time, has little flavor degradation for two to three days after opening and has a best before date of one week after opening. Other special designation sake and futsū-shu have little flavor degradation for 10 to 14 days after opening the bottle and have a best before date of one month after opening. Unpasteurized namazake deteriorates the fastest and should be drunk as soon as possible. On the other hand, the optimal temperature to minimize flavor degradation is minus 5 degrees Celsius (23 degrees Fahrenheit). It is also recommended that sake bottles be stored vertically. This is because if the bottle is placed horizontally, the sake is exposed to more air inside the bottle, which speeds up oxidation and may change the flavor when it comes in contact with the cap. If these types of sake, which were clear or white at first, turn yellow or brown, it is a sign that the flavor has deteriorated. The exception is aged koshu, which is amber in color from the time of shipment because it has been aged for several years to optimize its flavor. ==Ceremonial use==

Sake is often consumed as part of Shinto purification rituals. Sake served to gods as offerings before drinking are called or . In a ceremony called kagami biraki, wooden sake casks are opened with mallets during Shinto festivals, weddings, store openings, sports and election victories, and other celebrations. This sake, called ('celebration sake'), is served freely to all to spread good fortune. At the New Year, many Japanese people drink a special sake called toso. is a sort of made by soaking , a kampo (traditional Japanese medicine), overnight in sake. Even children sip a portion. In some regions, the first sips of are taken in order of age, from the youngest to the eldest. On Children's Day, May 5, there is a custom of drinking , which is made by cutting iris roots and leaves into thin slices and soaking them in sake, a tradition inherited from . It is believed that iris has the power to ward off evil spirits and has medicinal properties. File:Sake before the kagami biraki.jpg|A (straw mat cask) of sake before the kagami biraki File:SakeContainers.jpg|Decorative sake containers in a Nakatsugawa shop ==Global growth==

Sake has seen a significant rise in global popularity. Sake exports have increased by 70% since 2021, reaching 41.1 billion yen ($270.4 million) in 2023. The United States is the largest market for exported sake, importing 6,500 kiloliters. Despite this growth, sake remains a niche product in the United States, accounting for only 0.2% of the total alcohol market as of 2020. This suggests there is potential for further expansion, mainly as American consumers develop a taste for Japanese culture and cuisine. ==Events==

• October 1 is the official of Japan. It is also called "World Sake Day". It was designated by the Japan Sake and Shochu Makers Association in 1978. == Awards ==

Some of the top sake award sites include the World Sake Awards (part of World Drinks Awards), The Fine Sake Awards Japan, and the various regional competitions run by Japan's National Tax Agency (NTA), alongside major events like the International Wine Challenge (IWC), Kura Master and the Sake Challenges Series, like the London Sake Challenge, Milano Sake Challenge, Luxembourg Sake Challenge, Tokyo Sake Challenge offering global recognition and detailed regional results for brewers. ==See also==