res·o·ru·fin | \ ˌrezōˈrüfə̇n \
Definition of resorufin
: a red-brown crystalline dye C12H7NO3 of the phenoxazine class that gives fluorescent red or pink solutions, that is formed by the action of nitrosylsulfuric acid on resorcinol or by reduction of resazurin, and that on reduction yields a colorless dihydro derivative
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