Phthalocyanine blue is also known as Copper Phthaloc yanine blue; Monstral Fast blue; Winsor Blue; Bocour blue; Talens Rembrandt Blue; Thalo Blue; Heliogen Blue.Phthalocyanine blue is a permanent pigment which is unaffected by light, heat, and chemicals. It is used as a colorant in inks, enamels, plastics, paints, chalks, leather, pencils, and photographs. In industry, phthalocyanine blue has replaced all other blue pigments for use in coatings because it is lightfast as well as resistant to chemicals and clumping.