Copper Phthalocyanine Blue BN, also called by many names such as Pigment Blue, Pigment 15 is a bright, crystalline, synthetic blue pigment from the group of Phthalocyanine dyes. Its brilliant blue is frequently used in paints and dyes. It is highly valued for its superior properties such as light fastness, tinting strength, covering power and resistance to the effects of alkalis and acids. It has the appearance of a blue powder, insoluble in water and most solvents.