Phthalocyanine dyes and pigments:-
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Phthalocyanine dyes and pigments:-
These dyes and pigments have a common chromophore known as tetrabenzoporphyrazine:
In combination with copper (when copper phthalocyanine pigment is formed) it produces a bright turquoise blue colour, with outstanding light fastness Copper phthalocyanine is made by heating phthalonitrile with cuprous chloride at 1800-2000C or by heating phthalic anhydride with urea in the presence of cuprous chloride
