 pH above 5.6) or during spontaneous degradation.The metals in the Phthallocyanine nucleus and substituted groups directly attached to the aromatic nucleus determine colors of the members of the metal phthallocyanine family e.g.Alcian Blue and the copper phthalocyanine itself are blue, but brominated or chlorinated copper phthalocyanine and sulfonated copper phthalocyanine are green.