Iron blue nacreous coated pigments

A method for directly adhering Iron Blue to a mica or metal oxide coated mica substrate which comprises mixing said substrate with a soluble ferrocyanide and a soluble ferric compound in an aqueous medium such that there is at least 30% excess ferric ions based on the amount of ferric ion necessary to form Iron Blue, adjusting the pH to 3.5 to 5.5, recovering the resulting Iron Blue coated substrate and drying the recovered Iron Blue coated substrate at a temperature below the decomposition temperature of the Iron Blue.