Rose bengal

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Rose bengal (4,5,6,7-tetrachloro-2',4',5',7'-tetraiodofluorescein) is a stain. Rose bengal belongs to the class of organic compounds called xanthenes. Its sodium salt is commonly used in eye drops to stain damaged conjunctival and corneal cells and thereby identify damage to the eye.

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

Image: Elbreapoly, Public domain, via Wikimedia Commons.