One of the mysteries of the English language finally explained.
An orange-red crystalline dye, originally prepared by mild oxidation of pyrogallol and later found to occur in some oak galls.
Late 19th century; earliest use found in Journal of the Chemical Society. From French purpurogalline from purpur- (in purpurine) + -ogall- + -ine. The dye was so named after the unrelated purpurin by analogy with the preparation of that substance by oxidation of alizarin.
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