Cobalt Yellow

Cobalt Yellow, (Indian Yellow, Fischer’s salt), yellow pigment, consists of nitrate of cobalt oxide potash (cobalt potassium nitrite K6Co₂N₁₂O₂₄), is a yellow crystalline precipitate of a solution of nitrate of cobalt acidified with acetic acid and nitrous potash. Cobalt yellow is difficult to dissolve and, because of its purity, plays an important role in the preparation of pure and beautiful blue nuances for glass and porcelain painting and for the art of enamelling. It is also used as a yellow oil paint and watercolour and in chemical analysis to separate cobalt and nickel.

Source: Meyers Großes Konversations-Lexikon, 6. Auflage 1905–1909

Indian Yellow