What is eosin?

Eosin is a crystalline product of coal tar, used in solution to stain cells for microscopic study; it imparts a reddish color to the specimen.

Eosin is the name of several fluorescent acidic compounds which bind to and form salts with basic, or eosinophilic, compounds like proteins containing amino acid residues such as arginine and lysine, and stains them dark red or pink as a result of…

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