Pigment Blue 15:1 (Phthalocyanine Blue) is a bright, reddish-shade organic copper phthalocyanine pigment. Widely used in industrial applications, it is prized for its exceptional lightfastness, heat stability, and resistance to solvents, acids, and alkalis.Chemical Class: Copper Phthalocyanine (Alpha-modification)Color Index: C.I. 74160 | CAS No. 147-14-8Common Synonyms: Phthalo Blue, Alpha Blue