thioindigoid dye


variants or less commonly thioindigoid
: any of a class of vat dyes characterized by the same chromophore as indigo (see indigo sense 1b) but with sulfur instead of an imino group as an auxochrome compare indigoid dye

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“Thioindigoid dye.” Dictionary, Merriam-Webster, Accessed 28 Sep. 2023.

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