Viridian

Viridian pigment was first prepared in 1838 in Paris by Parisian color chemist and painter Pannetier alongside his assistant Binet as a hydrated form of chromium oxide. The preparation process was demanding, expensive, and shrouded in secrecy. The French chemist C. E. Guignet developed and patented a cheaper manufacturing method in 1859 that enabled larger distribution and use of the pigment. This method involved calcining a combination of boric acid and potassium bichromate, then washing the material. Winsor and Newton's catalogue listed the pigment as early as 1849. It was used as early as 1840 in a work by J. M. W. Turner. Viridian was in prominent use by the mid-nineteenth century, but was less popular than three to four times more affordable alternatives including emerald and chrome greens. == Visual characteristics ==

Viridian is a bright shade of spring green, which places the color between green and teal on the color wheel, or, in paint, a tertiary blue–green color. Viridian is dark in value, has medium saturation, and is transparent. ==Variations of viridian==

Paolo Veronese green {{infobox color Paolo Veronese green is the color that is called verde veronés in the Guía de coloraciones (Guide to colorations) by Rosa Gallego and Juan Carlos Sanz, a color dictionary published in 2005 that is widely popular in the Hispanophone realm. Paolo Veronese green was a color formulated and used by the noted 16th-century Venetian artist Paolo Veronese. Paolo Veronese green began to be used as a color name in English sometime in the 1800s (exact year uncertain). Another name for this color is transparent oxide of chromium. Viridian green {{infobox color At right is displayed the color viridian green. The source of this color is the "Pantone Textile Paper eXtended (TPX)" color list, color #17-5126 TPX—Viridian Green. Generic viridian {{infobox color Generic viridian is the color that is called Viridian inspecifico in the Guía de coloraciones (Guide to colorations) by Rosa Gallego and Juan Carlos Sanz, a color dictionary published in 2005 that is widely popular in the Hispanophone realm. Spanish viridian {{infobox color Spanish viridian is the color that is called Viridian specifico in the Guía de coloraciones (Guide to colorations) by Rosa Gallego and Juan Carlos Sanz, a color dictionary published in 2005 that is widely popular in the Hispanophone realm. == Permanence ==

Viridian is considered durable and permanent as an artist's pigment. Viridian is unaffected by temperatures up to 260 °C (500 °F), but it is unsuitable for use in ceramic glazes. Viridian is compatible with all pigments in all media, and has high oil absorption. Pure pigment formulations of viridian are hard and may separate in tubes, but adding barium sulfate in small quantities enables easy grinding and dispersion. ==Notable occurrences==

Although viridian is not a frequent color name in English, it is used in a number of cultural references, probably because it is derived from '', the Latin word for green, so using the word viridian sounds more elegant than simply referring to the Old English word green''. Fine art painting • Fritz Bamberger, Afterglow in the Sierra Nevada, 1863. Broadcasting • Viridian was the signature color of BBC Two's identity from 1991–2001. Environmental design • The viridian design movement is a popular design movement based on a bright green environmentalism philosophy. ==See also==