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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Time Traveler for tropaeolin
The first known use of tropaeolin was in 1878
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