This is an accepted version of this page Viridian is a blue-green pigment, a hydrated chromium(III) oxide, of medium saturation and relatively dark in value.

[4]: 276–77 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.

[4]: 275  The French chemist C. E. Guignet developed and patented a cheaper manufacturing method in 1859 that enabled larger distribution and use of the pigment.

[4]: 278  Pure pigment formulations of viridian are hard and may separate in tubes, but adding barium sulfate in small quantities enables easy grinding and dispersion.

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