Turnbulls Blue

Name:
Turnbulls Blue
Detailed information:
An inorganic blue pigment made by the reaction of a ferrous salt and potassium ferricyanide [Fe₃Fe(CN)₆]₂. One of its important uses is in making blueprints, in which sensitized paper containing ferric ammonium citrate and potassium ferricyanide is exposed to light, the ferric ions being thus reduced to ferrous ions.See Iron Blue.