FLUORESCENT DYE
\flʊ͡əɹˈɛsənt dˈa͡ɪ], \flʊəɹˈɛsənt dˈaɪ], \f_l_ʊə_ɹ_ˈɛ_s_ə_n_t d_ˈaɪ]\
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a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed)
By Princeton University
