Viridian is a blue-green pigment, a hydrated chromium(III) oxide, of medium saturation and relatively dark in value. It is composed more of green than blue. Specifically, it is a dark shade of spring green, the color between green and cyan on the color wheel, or, in paint, a tertiary blue–green color. Viridian takes its name from the Latin viridis, meaning "green".[3]
The first recorded use of viridian as a color name in English was in the 1860s (exact year uncertain).[4]
very stable and powerful cold green. It's a Chromium oxide dihydrate. Guignet of Paris patented the process for manufacturing viridian or transparent oxide of chromium in 1859. Its excellent permanence and lack of toxicity could replace all other greens, both ancient and modern.