From phthalo and blue, from phthalocyanine.
"phthalo-blue." YourDictionary, n.d. Web. 13 November 2018. <https://www.yourdictionary.com/phthalo-blue>.
phthalo-blue. (n.d.). Retrieved November 13th, 2018, from https://www.yourdictionary.com/phthalo-blue
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