Copper phthalocyanine

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What Wikipedia says

Copper phthalocyanine (CuPc), also called phthalocyanine blue, phthalo blue and many other names, is a bright, crystalline, synthetic blue pigment from the group of dyes based on phthalocyanines. Its brilliant blue is frequently used in paints and dyes.

Excerpt from the Wikipedia article “Copper phthalocyanine”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Leyo, Public domain, via Wikimedia Commons.