Synonyms: α-hydroxy-α,α-bis(5-hydroxycarvacryl)- o- toluenesulfonic acid γ-sultone; thymolsulfonephthalein; 3,3-Bis[4-hydroxy-2- methyl-5-(propan-2-yl)phenyl]-2,1λ6-benzoxathiole- 1,1(3H)-dione
Brownish-green to reddish-brown powder.
Transition Range: pH 1.2 to pH 2.8 (Pink to Yellow)
Absorptivity 1%:
At L max. 434.2 nm: (pH 7.8) – 285 to 290
At L max. 596.6 nm: (pH 9.5) – 538 to 543
Solubility: Clear solution (0.1% EtOH)
Loss on Drying: 3.0% max. at 110.0C
Assay: 95.0% min.
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