One of the mysteries of the English language finally explained.
A synthetic red azo dye, used in photography as a desensitizer; 3,7-diamino-5-phenylphenazinium chloride, C₁₈H₁₅N₄Cl.
Late 19th century; earliest use found in Journal of the Chemical Society. From pheno- + safranine, after German Phenosafranin.
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