1,8-Diazafluoran-9-one (DFO) [54078-29-4] We have exported to USA, ... France, Korea and so on. 1. 1,8-Diazafluoran-9-one (DFO) [54078-29-4]2. DFO is a fluorescent ... . Appearance Orange crystalline powder. fluorescent detection reagent 1,8-Diazafluoran-9-one (DFO)