华蓝，铁蓝，普鲁士蓝

Prussian Blue

The molecular formula is Fe(Mol)Fe(CN)6·H2O,which has appearance with dark blue powder. The hue is from deep blue to light blue. It has strong tinting strength, bright colour and high light resistance.

It is well used for  printing ink (offset, solvent) and paint , it is also well used for pesticide, it is in micronized powder, which as a mark  left on the grape leaves after spraying the pesticide by plane in the large grapery in Europe, such as Italy, France, Spain etc.