purpurogallin

noun
pur·​pu·​ro·​gal·​lin | \ˌpərpyərōˈgalə̇n\
plural -s

Definition of purpurogallin 

: a red crystalline phenolic ketone dye C11H4O(OH)4 that occurs naturally in various plant galls as the diglucoside and is made synthetically by oxidation of pyrogallol

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History and Etymology for purpurogallin

Latin purpura purple + English -o- + pyrogallol + -in

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