indigoid dye

variants: or indigoid vat dye or less commonly indigoid
plural -s

Definition of indigoid dye

: any of a class of vat dyes characterized by the same chromophore as indigo (see indigo sense 1b) — compare thioindigoid dye

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“Indigoid dye.” Dictionary, Merriam-Webster, Accessed 24 Oct. 2021.

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