Specification Product Name CRESOLPHTHALEIN Synonyms 3,3-Dimethylphthalein CAS NO. 596-27-0 Molecular Formula C22H18O4 Formula Weight 346.39 Appearance White Powder Structure     Tests    Limits Solubility 0.1% (Ethanol) - Clear Solution Transition range - pH 8.2-9.8 (Colourless – Violet Red) Absorptivity 1%,1cm (in 0.1N NaOH) at λ max.568.0nm - >1800 Loss on Drying at 110°C (1hr) - <1%         REVISED: 1-1-2012