phthalocyanine
noun
phtha·lo·cy·a·nine
ˌtha-lō-ˈsī-ə-ˌnēn
ˌthā-
: a bright greenish-blue crystalline compound C32H18N8
also
: any of several metal derivatives that are brilliant fast blue to green dyes or pigments
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Merriam-Webster unabridged
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