Product : o - Cresolphthalein C.A.S. No. :596-27-0 M.F. :C22H18O4 M.W. :346.38gm/mole Specifications: Dye Content (by Spectrophotometry) = >95% Appearance = White-Off white powder Solubility 0.1% (EtOH) = Clear solution Transition Range = pH 8.2-9.8 Colorless-Red Absorption maximum (0.1N NaOH) at ?max = 564-568nm Absorptivity (A1%1cm in 0.1N NaOH at ?max) = >1670 Loss On Drying (110�°C) =