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Brown-green crystalline powder with peculiar odor; soluble in ethanol, it turns yellow, soluble in dilute lye, it turns blue, insoluble in water; the maximum absorption wavelength is 594 (376) nm, insoluble in water, soluble in ethanol, and it turns yellow. It is prepared by the condensation of Liphenol and o-sulfobenzoic anhydride, and there are two discoloration ranges: (1) the acid range is pH 1.2-2.8, from red to yellow; (2) the alkali range is pH 8.0-9.6, from Yellow to blue.
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