December 2009 PFFC

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Phthalo Green: How Can You Tell If It's Always the Same?

Recently, a question came in from one of our readers (thank you, Joe Woods) as to how one can assure the copper phthalocyanine green pigment purchased from two suppliers is the same chemically. Pigment Green 7 has a CAS Registry Number of 1328-53-6. It is commonly referred to as Phthalo Green and has a bright bluish green color. Copper phthalocyanine green pigment is a unique product that is essentially copper phthalocyanine blue pigment in which most of the hydrogen atoms have been replaced with chlorine atoms. The commercial chemical composition of copper phthalocyanine green can vary due to ...

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