108 results about "Prussian blue" patented technology

Prussian blue is a dark blue pigment produced by oxidation of ferrous ferrocyanide salts. It has the chemical formula Feᴵᴵᴵ₄[Feᴵᴵ(CN)₆]₃. Another name for the color is Berlin blue or, in painting, Parisian or Paris blue. Turnbull's blue is the same substance, but is made from different reagents, and its slightly different color stems from different impurities.