tropaeolin

noun, often capitalized

tro·pae·o·lin

variants: or tropeolin \ trōˈpēələ̇n \

plural -s

Definition of tropaeolin

: any of several orange or orange-yellow azo dyes some of which (as methyl orange) are used as acid-base indicators or as biological stains

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The first known use of tropaeolin was in 1878

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