Specification Product Name FLUORESCEIN Synonyms SOLVENT YELLOW 94 C.I. NO. 45350 CAS NO. 2321-07-05 Molecular Formula C20H12O5 Formula Weight 332.31 Appearance Dark Orange Powder Structure     Tests    Limits Absorptivity 1%/1cm , (pH8.0) at max.490.0 nm - 2200-2500 Solubility 0.1% (0.1N NaOH) - Clear Yellow Solution with greenish Fluorescence Loss on Drying at 110°C (1hr) - < 1%         REVISED: 1-1-2012