Pronunciation: (thal"u-sī'u-nēn", -nin, fthal"-),[key] —n.Chem. 1. Also called metal-free phthalocyanine. a blue-green pigment, C32H18N8, derived from phthalic anhydride.
2. any of the group of blue or green pigments produced by the interaction of metal-free phthalocyanine and a metal, esp. copper: used chiefly in the manufacture of enamels, printing inks, and automotive finishes.