Product: Cresol Red C.A.S. No. : 1733-12-6 M.F : C21H18O5S M.W. ; 382.43gm/mole. Specifications: Dye Content (by Spectrophotometry) = >95% Transition Range = pH 6.5-8.8 ,Yellow-Purple Solubility 0.1% (95% EtOH) = Clear solution Absorption maximum (pH 6.5) ?1max = 432-436nm Absorption maximum (pH 8.8) ?2max = 571-574nm Absorptivity (A1%/1cm at pH 6.5 at ?1max) = 490-540 Absorptivity (A1%/1cm at pH 8.8 at ?2max) = 1000-1100 Loss On Drying (110�°C) =