History of paper

Papyrus The word "paper" is etymologically derived from papyrus, Ancient Greek for the Cyperus papyrus plant. Papyrus is a thick, paper-like material produced from the pith of the Cyperus papyrus plant which was used in ancient Egypt and other Mediterranean societies for writing long before paper was used in China. Papyrus is prepared by cutting off thin ribbon-like strips of the pith (interior) of the Cyperus papyrus plant and then laying out the strips side-by-side to make a sheet. A second layer is then placed on top, with the strips running perpendicular to the first. The two layers are then pounded together using a mallet to make a sheet. The result is very strong, but has an uneven surface, especially at the edges of the strips. When used in scrolls, repeated rolling and unrolling causes the strips to come apart again, typically along vertical lines. This effect can be seen in many ancient papyrus documents. Paper contrasts with papyrus in that the plant material is broken down through maceration or disintegration before the paper is pressed. This produces a much more even surface and no natural weak direction in the material which falls apart over time. Unlike paper, papyrus is created by pressing, matting, and pounding the Cyperus papyrus plant, which only grew in Egypt and Sicily, and drying it to create the end product. The words 'papyrus' and its derivative, 'paper', have often been used interchangeably despite referring to different products created through different methods. Although it was used to great effect in Greece and Rome, papyrus has several downsides compared to paper. It was geographically limited by the Cyperus papyrus plant, which was primarily grown in Egypt. The Arabs tried to grow the plant north of Baghdad in the 830s but failed. While not especially expensive, it was more laborious to create papyrus with an even surface, and paper was more abundant and affordable than papyrus. It was also fragile, sensitive to moisture, and restricted to a scroll format of no more than 30–35 feet. By the end of the 9th century, paper had become more popular than papyrus in the Muslim World. In Asia and Africa, paper displaced papyrus as the primary writing material by the mid-10th century. In Europe, papyrus co-existed with parchment for several hundred years until it largely disappeared by the 11th century. ==Paper in China==

, circa 179 BCE wrapping paper, Western Han period of China, circa 100 BCE ), the Diamond Sutra of 868, shows the widespread availability and practicality of paper in China. Archaeological evidence of papermaking predates the traditional attribution given to Cai Lun, an imperial eunuch official of the Han dynasty (202 BCE – 220 CE), thus the exact date or inventor of paper cannot be deduced. The earliest extant paper fragment was unearthed at Fangmatan in Gansu province, and was likely part of a map, dated to 179–141 BCE. Fragments of paper have also been found at Dunhuang dated to 65 BCE and at Yumen pass, dated to 8 BCE. The invention traditionally attributed to Cai Lun, recorded hundreds of years after it took place, is dated to 105 CE. The innovation is a type of paper made of mulberry and other bast fibres along with fishing nets, old rags, and hemp waste which reduced the cost of paper production, which prior to this, and later, in the West, depended solely on rags. Techniques During the Shang (1600–1050 BC) and Zhou (1050–256 BC) dynasties of ancient China, documents were ordinarily written on bone or bamboo (on tablets or on bamboo strips sewn and rolled together into scrolls), making them very heavy, awkward to use, and hard to transport. The light material of silk was sometimes used as a recording medium, but was normally too expensive to consider. The Han dynasty Chinese court official Cai Lun (c. 50–121 AD) is credited as the inventor of a method of papermaking (inspired by wasps and bees) using rags and other plant fibers in 105 AD. However, the discovery of specimens bearing written Chinese characters in 2006 at Fangmatan in north-east China's Gansu Province suggests that paper was in use by the ancient Chinese military more than 100 years before Cai, in 8 BC, and possibly much earlier as the map fragment found at the Fangmatan tomb site dates from the early 2nd century BC. Cai Lun's biography in the Twenty-Four Histories says: :In ancient times writings and inscriptions were generally made on tablets of bamboo or on pieces of silk called chih. But silk being costly and bamboos heavy they were not convenient to use. Tshai Lun then initiated the idea of making paper from the bark of trees, remnants of hemp, rags of cloth and fishing nets. He submitted the process to the emperor in the first year of Yuan-Hsing (105 AD) and received praise for his ability. From this time, paper has been in use everywhere and is universally called the paper of Marquis Tshai. The production process may have originated from the practice of pounding and stirring rags in water, after which the matted fibres were collected on a mat. The bark of paper mulberry was particularly valued and high quality paper was developed in the late Han period using the bark of tán (檀; sandalwood). Although bark paper emerged during the Han dynasty, the predominant material used for paper was hemp until the Tang dynasty when rattan and mulberry bark paper gradually prevailed. After the Tang dynasty, rattan paper declined because it required specific growing areas, was slow in growth, and had a long regeneration cycle. The most prestigious kind of bark paper was known as Chengxintang Paper, which emerged during the Five Dynasties and Ten Kingdoms period, and was only used for imperial purposes. Ouyang Xiu described it as shiny, elaborate, smooth, and elastic. In the Eastern Jin period a fine bamboo screen-mould treated with insecticidal dye for permanence was used in papermaking. After printing was popularized during the Song dynasty the demand for paper grew substantially. The supply of bark could not keep up with the demand for paper, resulting in the invention of new kinds of paper using bamboo during the Song dynasty. In the year 1101, 1.5 million sheets of paper were sent to the capital. Padding doubled as both protection for the object as well as the user in cases where poisonous "medicine" were involved, as mentioned in the official history of the period. paper continued to be used for wrapping (and other) purposes. Toilet paper was used in China from around the late 6th century. In 589, the Chinese scholar-official Yan Zhitui (531–591) wrote: "Paper on which there are quotations or commentaries from Five Classics or the names of sages, I dare not use for toilet purposes". Impact of paper According to Timothy Hugh Barrett, paper played a pivotal role in early Chinese written culture, and a "strong reading culture seems to have developed quickly after its introduction, despite political fragmentation." Indeed, the introduction of paper had immense consequences for the book world. It meant books would no longer have to be circulated in small sections or bundles, but in their entirety. Books could now be carried by hand rather than transported by cart. As a result, individual collections of literary works increased in the following centuries. Textual culture seems to have been more developed in the south by the early 5th century, with individuals owning collections of several thousand scrolls. In the north an entire palace collection might have been only a few thousand scrolls in total. By the early 6th century, scholars in both the north and south were capable of citing upwards of 400 sources in commentaries on older works. A small compilation text from the 7th century included citations to over 1,400 works. The personal nature of texts was remarked upon by a late 6th century imperial librarian. According to him, the possession of and familiarity with a few hundred scrolls was what it took to be socially accepted as an educated man. According to Endymion Wilkinson, one consequence of the rise of paper in China was that "it rapidly began to surpass the Mediterranean empires in book production." During the Tang dynasty, China became the world leader in book production. In addition the gradual spread of woodblock printing from the late Tang and Song further boosted their lead ahead of the rest of the world. However, despite the initial advantage afforded to China by the paper medium, by the 9th century its spread and development in the Middle East had closed the gap between the two regions. Between the 9th to early 12th centuries, libraries in Cairo, Baghdad, and Cordoba held collections larger than even the ones in China, and dwarfed those in Europe. From about 1500 the maturation of paper making and printing in Southern Europe also had an effect in closing the gap with the Chinese. The Venetian Domenico Grimani's collection numbered 15,000 volumes by the time of his death in 1523. After 1600, European collections completely overtook those in China. The Bibliotheca Augusta numbered 60,000 volumes in 1649 and surged to 120,000 in 1666. In the 1720s the Bibliothèque du Roi numbered 80,000 books and the Cambridge University 40,000 in 1715. After 1700, libraries in North America also began to overtake those of China, and toward the end of the century, Thomas Jefferson's private collection numbered 4,889 titles in 6,487 volumes. The European advantage only increased further into the 19th century as national collections in Europe and America exceeded a million volumes while a few private collections, such as that of Lord Acton, reached 70,000. Paper became central to the three arts of China – poetry, painting, and calligraphy. In later times paper constituted one of the 'Four Treasures of the Scholar's Studio,' alongside the brush, the ink, and the inkstone. ==Paper in Asia==

After its origin in central China, the production and use of paper spread steadily. It is clear that paper was used at Dunhuang by 150 CE, in Loulan in the modern-day province of Xinjiang by 200, and in Turpan by 399. Paper was concurrently introduced in Japan sometime between the years 280 and 610. Eastern Asia Paper spread to Vietnam in the 3rd century, to Korea in the 4th century, and to Japan in the 5th century. The paper of Korea was famed for being glossy white and was especially prized for painting and calligraphy. It was among the items commonly sent to China as tribute. The Koreans spread paper to Japan possibly as early as the 5th century but the Buddhist monk Damjing's trip to Japan in 610 is often cited as the official beginning of papermaking there. Islamic world Bible from Egypt in the Islamic period, 8th century or later. Origin Paper was used in Central Asia by the 8th century but its origin is not clear. According to the 11th century Persian historian, Al-Thaʽālibī, Chinese prisoners captured at the Battle of Talas in 751 introduced paper manufacturing to Samarkand. However, there are no contemporary Arab sources for this battle. A Chinese prisoner, Du Huan, who later returned to China reported weavers, painters, goldsmiths, and silversmiths among the prisoners taken, but no papermakers. According to Al-Nadim, a writer in Baghdad during the 10th century, Chinese craftsmen made paper in Khorasan: According to Jonathan Bloom, a scholar of Islamic and Asian art with a focus on paper and printing, the connection between Chinese prisoners and the introduction of paper in Central Asia is "unlikely to be factual". Archaeological evidence shows that paper was already known and used in Samarkand decades before 751 CE. Seventy-six texts in Sogdian, Arabic, and Chinese have also been found near Panjakent, likely predating the Muslim conquest of Transoxiana. Bloom argues that based on differences in Chinese and Central Asian papermaking techniques and materials, the story of Chinese papermakers directly introducing paper to Central Asia is probably metaphorical. Chinese paper was mostly made of bast fibers while Islamic paper was primarily made of waste material like rags. The paper-making innovations in Central Asia may be pre-Islamic, probably aided by the Buddhist merchants and monks of China and Central Asia. The Islamic civilization helped spread paper and paper-making into the Middle East after the 8th century. It arrived into Europe centuries later, and then to many other parts of the world. A historical remnant of this legacy is the continued use of the word "ream" to count bundles of paper, a word derived from Arabic rizma (bundle, bale). There are records of paper being made at Gilgit in Pakistan by the sixth century, in Samarkand by 751, in Baghdad by 793, in Egypt by 900, and in Fes, Morocco around 1100, in Syria e.g. Damascus, and Aleppo, in Andalusia around 12th century, in Persia e.g. Maragheh by 13th century, Isfahan by 14th century, Ghazvin and Kerman, in India e.g. Dowlat Abad by the 16th century. A Persian geography book written by an unknown author in the 10th century, Hodud al-Alam, is the oldest known manuscripts mentioning papermaking industry in Samarkand. The writer stated that the city was famous for paper manufacturing and the product was exported to many other cities as a high-quality item. Samarkand kept its reputation for papermaking over few centuries even once the industry spread across other Islamic areas. For instance, it is said that some ministers in Egypt preferred ordering their required paper to Samarkand from which the paper was transported all the way to Egypt. In Baghdad, particular neighborhoods were allocated to paper manufacturing and in Bazaar paper merchants and sellers owned distinct sectors being called Paper Market or Suq al-Warraqin, a street which was lined with more than 100 paper and booksellers' shops. In 1035 a Persian traveler, Nasir Khusraw, visiting markets in Cairo noted that vegetables, spices and hardware were wrapped in paper for the customers. In the 12th century one street named "Kutubiyyin" or book sellers Morocco as it contained more than 100 bookshops. The expansion of public and private libraries and illustrated books within Islamic lands was one of the notable outcomes of the drastic increase in the availability of paper. However, paper was still an upmarket good given the remarkable required inputs, e.g. primary materials and labours, to produce the item in the absence of advanced mechanical machinery. In one account Ibn al-Bawwab, a Persian calligrapher and illuminator, had been promised by the Sultan to be given precious garments in response to his services. When the Sultan deferred delivering the promised clothes, he instead proposed taking the papers stored in the Sultan's library as his present. Types of paper A wide range of papers with distinctive properties and varying places of origin were manufactured and utilised across Islamic domains. Papers were typically named based on several criteria: • Origins (e.g.Isfahani, Baghdadi, Halabi, Mesri, Samarkandi, Dowlat Abadi, Shami, Charta Damascena), • Sizes (Solsan, Nesfi,...), • People who have supported the paper development (e.g. Nuhi, Talhi, Jafari, Mamuni, Mansouri). Paper primary materials Bast (hemp and flax), cotton, and old rags and ropes were the major input materials for producing the pulp. Sometimes a mixture of materials was also used for pulp making, such as cotton and hemp, or flax and hemp. Other uncommon primary materials such as fig tree bark are also reported in some manuscripts. Papermaking process Very few sources have mentioned the methods, phases and applied tools in the papermaking process though. A painting from an illustrated book in Persian has depicted different stages and required tools of the traditional workflow. The painting has distinguished two major phases of the papermaking process: • Pulp making and pulp dewatering: water power mill mixes linen wastes (Karbas) and rags, as the primary materials of papermaking, with water. They are well beaten in stone pits. In the next step, the watery pulp is poured into a piece of fabric, tied around two workers’ waists, to get initially dewatered and probably homogenised and purified. Once the pulp is dewatered into a considerable extent it passes through the next treatment phase. • Paper final treatments: this phase consists of several consequent steps e.g. moulding the pulp with a square laid with wire-like lines (dipping the mould in the vat containing pulp), pressing, sizing, drying and polishing. Each step in this phase is undertaken by a particular device. For instance, in the drying process, the paper was stuck to the wall with the use of horsehair. A manuscript from the 13th century elaborates the process of papermaking. This text shows how papermakers undertook multiple steps to produce high-quality paper. This papermaking instruction or recipe is a chapter under the title of al-kāghad al-baladī ('local paper') from the manuscript of al-Mukhtaraʿ fī funūn min al-ṣunaʿ, attributed to al-Malik al-Muẓaffar Yusuf al-Ghassan (d. 694/1294), a Yemeni ruler of the Rasulid dynasty. The bark of fig trees, as the main source of papermaking in this recipe, went through frequent cycles of soaking, beating and drying. The process took 12 days to produce 100 sheets of high-quality paper. During the pulping stage, the beaten fibres were transformed into different sizes of Kubba (cubes) which they were used as standard scales to manufacture a certain number of sheets. The dimensions were determined based on three citrus fruit: ('lemon'), ('citron') and ('Seville orange'). A summarized version of this detailed process is as below. Each individual phase was repeated several times. • Soaking paper in a pool • Dewatering paper through squeezing and pressing • Making balls from the pulp • Pressing the balls • Drying the paper by sticking them to the wall and exposing the final product into the sun The laborious process of papermaking was refined and machinery was designed for bulk manufacturing of paper. Production began in Baghdad, where a method was invented to make a thicker sheet of paper, which helped transform papermaking from an art into a major industry. The use of water-powered pulp mills for preparing the pulp material used in papermaking dates back to Samarkand in the 8th century. Paper manufacture was introduced to India in the 13th century by Arab merchants, where it almost wholly replaced traditional writing materials. Its use is mentioned by 7th– and 8th-century Chinese Buddhist pilgrim memoirs as well as some Indian Buddhists, as Kakali and Śaya – likely Indian transliteration of Chinese Zhǐ (tsie). Yijing wrote about the practice of priests and laypeople in India printing Buddha image on silk or paper, and worshipping these images. Elsewhere in his memoir, I-Ching wrote that Indians use paper to make hats, to reinforce their umbrellas and for sanitation. According to Irfan Habib, it is reasonable to presume that paper manufacturing reached Sindh (now part of south Pakistan) before 11th-century with the start of Arab rule in Sindh. Amir Khusrau of Delhi Sultanate mentions paper-making operations in 1289. The use of tree bark as a raw material for paper suggests that the paper manufacturing in the eastern states of India may have come directly from China, rather than Sultanates formed by West Asian or Central Asian conquests. Further, the analysis of the woodblock book covers of these historic manuscripts has confirmed that it was made of tropical wood indigenous to India, not Tibet. Kaghaz The Persian word for paper, (), is a borrowing from Sogdian kʾɣδʾ, itself a possible loan from Chinese (紙). This word, kaghaz, was loaned into numerous other languages, including Arabic ()—an early development which may have shaped the spelling of the Persian word itself—Bengali (কাগজ), Georgian (ქაღალდი), Kurdish, Marathi (कागद), Nepali, Telugu, and the various Turkic languages. Following the Ottoman conquest of the Balkans, the Persian word kaghaz entered the languages of the region through Ottoman Turkish (, Modern Turkish ), including Serbian where it generated the word for "documentation" (ćage). Historian Nile Green explains that the increased access to paper had a role in the expansion of Persian into bureaucratic and in turn literary activities, that is, the domain of written Persian ("Persographia") in large parts of Eurasia. ==Paper in Europe==

, printed on paper during the 1450s, in the New York Public Library The oldest known paper document in Europe is the Mozarab Missal of Silos from the 11th century, probably using paper made in the Islamic part of the Iberian Peninsula. They used hemp and linen rags as a source of fiber. The first recorded paper mill in the Iberian Peninsula was in Xàtiva in 1056. Papermaking reached Europe as early as 1085 in Toledo and was firmly established in Xàtiva, Spain by 1150. During the 13th century mills were established in Amalfi, Fabriano, and Treviso, Italy, and other Italian towns by 1340. Papermaking then spread further northwards, with evidence of paper being made in Troyes, France by 1348, in Holland sometime around 1340–1350, and in Nuremberg, Germany by 1390 in a mill set up by Ulman Stromer. This was just about the time when the woodcut printmaking technique was transferred from fabric to paper in the old master print and popular prints. There was a paper mill in Switzerland by 1432 and the first mill in England was set up by John Tate around 1490 near Hertford, but the first commercially successful paper mill in Britain did not occur before 1588 when John Spilman set up a mill near Dartford in Kent. During this time, paper making spread to Austria by 1469, to Poland by 1491, to Russia by 1576, to the Netherlands by 1586, to Denmark by 1596, and to Sweden by 1612. They adapted the waterwheels from the fuller's mills to drive a series of three wooden hammers per trough. The hammers were raised by their heads by cams fixed to a waterwheel's axle made from a large tree trunk. ==Americas==

is similar to modern paper but has a more fibrous texture. Amate In the Americas, archaeological evidence indicates that a similar bark-paper writing material was used by the Maya no later than the 5th century CE. Called amatl or amate, it was in widespread use among Mesoamerican cultures until the Spanish conquest. The earliest sample of amate was found at Huitzilapa near the Magdalena Municipality, Jalisco, Mexico, belonging to the shaft tomb culture. It is dated to 75 BCE. There is some uncertainty as to whether or not the Mesoamerican paper can be considered true paper owing to the thorough destruction of their civilization by the Spanish. The Mayans used a writing material called huun starting from the 5th century. It was made from the inner bark of the wild fig tree. It was cut and stretched thin rather than made of randomly woven fibers, which according to one source, disqualified it as true paper. The Mayans made codices out of huun. The Toltecs and Aztecs also had their own form of paper. The Aztec amatl (amate) was used for writing, decorations, rituals, and as material for masks. Aztec paper, like Mayan paper, is not considered true paper by some. Like its predecessors, it was made from the inner bark of the wild fig tree, beaten, stretched, and dried. There are also records of paper made from agave, which was coarse and bumpy, and was probably used for purposes other than writing. After the Spanish conquest of the Aztec Empire, the Aztecs began using paper imported by the Spanish for works such as the Codex Mendoza. There were 42 amate producing Aztec villages prior to the Spanish Conquest, all of which have ceased their operations by the modern day. The Otomi people in Mexico still make amate today but have trouble meeting demand due to a dwindling supply of fig and mulberry trees, which are in danger of extinction. United States European papermaking spread to the Americas first in Mexico by 1575 and then in Philadelphia by 1690. The earliest of these mills were centered in New England and Upstate New York, the latter of which became home to International Paper, the largest pulp and paper company in the world, which held a 20% market share in 2017, and at its peak produced more than 60% of the continent's newsprint in 1898, before an industry shift to Canada. Chief among papermaking cities in New England and the world was Holyoke, Massachusetts, at one time making 80% of the writing paper of the United States and home to the ill-fated American Writing Paper Company, the world's largest producer of fine papers by 1920. By 1885 the Paper City, as it is still called, produced 190 tons per day, more than twice Philadelphia's capacity. Quickly it became a hub of paper machinery and turbine technology, host to the largest paper mills in the world in the 1890s, and D. H. & A. B. Tower, the largest paper mill engineering firm in the United States in the 19th century. The Tower Brothers and their associates would be responsible for designing mills on five continents. In the United States the firm supported the Berkshires' paper industry, building the first mills used to make U.S. currency by the Crane Company, as well as the first sulfite process mills of Kimberly Clark in Wisconsin, allowing the company to be the first west of the Appalachians to adopt the process, with access to vast forest resources. The pulp and paper industry continued to develop in other regions, including California, Ohio's Miami Valley, with centers in Dayton, Hamilton, and Cincinnati, as well as regions of the South, like Texas and Georgia, the latter being home to Georgia Pacific and WestRock, the 2nd and 3rd respective largest paper producers in the United States today. Wisconsin's industry nevertheless endured and as of 2019 it had far and away the most paper manufacturers in the country, with 34 such enterprises. While only smaller specialty manufacturers remained in Pennsylvania and New England, New York retained 28 mills, followed by Georgia with 20, Michigan with 17, and Alabama with 16 respectively. == Paper mills ==

paper mill, the building complex at the lower right corner, in 1493. Due to their noise and smell, paper mills were required by medieval law to be erected outside the city perimeter. The use of human and animal powered mills was known to Chinese and Muslim papermakers. However, the evidence for water-powered paper mills is elusive among both prior to the 11th century. Scholars have identified paper mills, likely human or animal powered, in Abbasid-era Baghdad during 794–795. It is evident that throughout the Islamic lands e.g. Iran, Syria (Hama and Damascus), and North Africa (Egypt and Tripoli) water power mills were extensively used to beat the flax and rag wastes to prepare the paper pulp Donald Hill has identified a possible reference to a water-powered paper mill in Samarkand, in the 11th-century work of the Persian scholar Abu Rayhan Biruni, but concludes that the passage is "too brief to enable us to say with certainty" that it refers to a water-powered paper mill. This is seen by Halevi as evidence of Samarkand first harnessing waterpower in the production of paper, but notes that it is not known if waterpower was applied to papermaking elsewhere across the Islamic world at the time. Burns remains sceptical, given the isolated occurrence of the reference and the prevalence of manual labour in Islamic papermaking elsewhere prior to the 13th century. Clear evidence of a water-powered paper mill dates to 1282 in the Iberian Crown of Aragon. A decree by the Christian king Peter III addresses the establishment of a royal "molendinum", a proper hydraulic mill, in the paper manufacturing centre of Xàtiva. though it appears to have been resented by sections of the local Muslim papermakering community; the document guarantees them the right to continue the way of traditional papermaking by beating the pulp manually and grants them the right to be exempted from work in the new mill. The first paper mill north of the Alps was established in Nuremberg by Ulman Stromer in 1390; it is later depicted in the lavishly illustrated Nuremberg Chronicle. From the mid-14th century onwards, European paper milling underwent a rapid improvement of many work processes. ==Fiber sources==

Before the industrialisation of the paper production the most common fibre source was recycled fibres from used textiles, called rags. The rags were from hemp, linen and cotton. It was not until the introduction of wood pulp in 1843 that paper production was not dependent on recycled materials from ragpickers. It was not realized at the time how unstable wood pulp paper is. A means of removing printing inks from paper, allowing it to be re-used, was invented by German jurist Justus Claproth in 1774. Today this process is called deinking. ==19th-century advances in papermaking==

Although cheaper than vellum, paper remained expensive, at least in book-sized quantities, through the centuries, until the advent of steam-driven paper making machines in the 19th century, which could make paper with fibres from wood pulp. Although older machines pre-dated it, the Fourdrinier papermaking machine became the basis for most modern papermaking. Nicholas Louis Robert of Essonnes, France, was granted a patent for a continuous paper making machine in 1799. At the time he was working for Leger Didot with whom he quarrelled over the ownership of the invention. Didot sent his brother-in-law, John Gamble, to meet Sealy and Henry Fourdrinier, stationers of London, who agreed to finance the project. Gamble was granted British patent 2487 on 20 October 1801. With the help particularly of Bryan Donkin, a skilled and ingenious mechanic, an improved version of the Robert original was installed at Frogmore Paper Mill, Hertfordshire, in 1803, followed by another in 1804. A third machine was installed at the Fourdriniers' own mill at Two Waters. The Fourdriniers also bought a mill at St Neots intending to install two machines there and the process and machines continued to develop. However, experiments with wood showed no real results in the late 18th century and at the start of the 19th century. By 1800, Matthias Koops (in London, England) further investigated the idea of using wood to make paper, and in 1801 he wrote and published a book titled Historical account of the substances which have been used to describe events, and to convey ideas, from the earliest date, to the invention of paper. His book was printed on paper made from wood shavings (and adhered together). No pages were fabricated using the pulping method (from either rags or wood). He received financial support from the royal family to make his printing machines and acquire the materials and infrastructure needed to start his printing business. But his enterprise was short lived. Only a few years following his first and only printed book (the one he wrote and printed), he went bankrupt. The book was very well done (strong and had a fine appearance), but it was very costly. Then in the 1830s and 1840s, two men on two different continents took up the challenge, but from a totally new perspective. Both Friedrich Gottlob Keller and Charles Fenerty began experiments with wood but using the same technique used in paper making; instead of pulping rags, they thought about pulping wood. And at about the same time, by mid-1844, they announced their findings. They invented a machine which extracted the fibres from wood (exactly as with rags) and made paper from it. Charles Fenerty also bleached the pulp so that the paper was white. This started a new era for paper making. By the end of the 19th-century almost all printers in the western world were using wood instead of rags to make paper. Together with the invention of the practical fountain pen and the mass-produced pencil of the same period, and in conjunction with the advent of the steam driven rotary printing press, wood based paper caused a major transformation of the 19th-century economy and society in industrialized countries. With the introduction of cheaper paper, schoolbooks, fiction, non-fiction, and newspapers became gradually available by 1900. Cheap wood based paper also meant that keeping personal diaries or writing letters became possible and so, by 1850, the clerk, or writer, ceased to be a high-status job. Early wood-based paper deteriorated as time passed, meaning that much of the output of newspapers and books from this period either has disintegrated or is in poor condition; some has been photographed or digitized (scanned). The acid nature of the paper, caused by the use of alum, produced what has been called a slow fire, slowly converting the paper to ash. Documents needed to be written on more expensive rag paper. In the 2nd half of the 20th century cheaper acid-free paper based on wood was developed, and it was used for hardback and trade paperback books. However, paper that has not been de-acidified was still cheaper, and remains in use (2020) for mass-market paperback books, newspapers, and in underdeveloped countries. ==Determining provenance==

Determining the provenance of paper is a complex process that can be done in a variety of ways. The easiest way is using a known sheet of paper as an exemplar. Using known sheets can produce an exact identification. Next, comparing watermarks with those contained in catalogs or trade listings can yield useful results. Inspecting the surface can also determine age and location by looking for distinct marks from the production process. Chemical and fiber analysis can be used to establish date of creation and perhaps location. ==See also==