1) Chelating agent 
Phthalocyanine is an intensely blue-green-coloured aromatic macrocyclic compound that is widely used in dyeing. Phthalocyanines form coordination complexes with most elements of the periodic table. These complexes are also intensely colored and also are used as dyes or pigments. ==Properties== Unsubstituted phthalocyanine, abbreviated {chem|H|2|Pc...
The main pigment in the manufacture of cyan ink.