Title: Azolitmin
CAS Registry Number: 1395-18-2
Literature References: Purified coloring matter from litmus: I. M. Kolthoff, C. Rosenblum, Acid-Base Indicators (MacMillan Co., New York, 1937) pp 160-162, 174, 208, 355, 361, 365-366, 368-369, 373, 377, 387.
Properties: Dark violet scales or dark red powder. Sparingly soluble in water; insol in alc; freely sol in dil alkali hydroxides or carbonates. The indicator solution is prepared by dissolving 0.5 g in 80 ml of warm H2O, then adding 20 ml alcohol.
Use: Indicator instead of litmus. pH: 4.5 red, 8.3 blue. Usable with most mineral, some organic acids (not hydroxy acids) and some alkaloids; also used for preparing litmus media for bacteriologic purposes.

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