Chromotropic acid

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What Wikipedia says

Chromotropic acid is an organic compound with the chemical formula (HO)2C10H4(SO3H)2. Its name is derived from the two ancient Greek words χρωμός (chromos, color) and τροπέιν or τρέπω (verb: tropein, trepo, changing, turning), meaning it changes of color when reacting with some other compounds.

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

Image: Kopiersperre (talk), Public domain, via Wikimedia Commons.