Indicator Content：≥95.0%
Loss on Drying：≤1.0%
Residue on Ignition：≤0.2%
pH Transition Range：3.0～4.6
Water Insoluble Matter：≤0.5%
Heavy Metals：≤10 ppm
Appearance：Conforms to standard
Identification：Color reaction qualified
Acid-base indicator
Typical acidic indicator, color changes from yellow to blue at pH 3.0~4.6, applied in strong acid titration of weak base. Analytical chemical reagent
Used for water quality analysis, solution pH detection and buffer system monitoring. Microscopic staining agent
Applied in simple staining of biological tissues and cell sections for microscopic observation. Laboratory research material
Widely used in chemical experiments, teaching analysis and standard color solution preparation. Dyeing auxiliary
Served as auxiliary additive for acid dyes and intermediate of color lake synthesis. 
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