Indigo carmine

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

Indigo carmine, or 5,5′-indigodisulfonic acid sodium salt, is an organic salt derived from indigo by aromatic sulfonation, which renders the compound soluble in water.

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

Image: Yikrazuul, Public domain, via Wikimedia Commons.