Fluoran
Encyclopedia
Fluoran is a triarylmethane dye
Triarylmethane dye
Triarylmethane dyes are synthetic organic compounds containing triphenylmethane backbones. As dyes, these compounds are intensely colored. Many of these dyes undergo reactions in response to acid and base, and thus serve as pH indicators....

. It is the structural core of a variety of other dyes.

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