Indophenol

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Indophenol is an organic compound with the formula OC6H4NC6H4OH. It is deep blue dye that is the product of the Berthelot's reaction, a common test for ammonia. The indophenol group, with various substituents in place of OH and various ring substitutions, is found in many dyes used in hair coloring and textiles.

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

Image: Yikrazuul, Public domain, via Wikimedia Commons.