Description: 
Appearance: A shiny purple crystallization or red brown powder.
Solubility: Soluble in alcohol and acetic acid, hardly soluble in water.
Melting point: 181～182℃.
Used: Protozoa liing dyeing. PH indicator, pH range discoloration 4.4 (red) ~ 6.2 (yellow). Titration ammonia, weak organic alkali and alkaloid, but not for GuWeiSuan except oxalate and outside of organic acid. But with bromine cresol green and methylene blue component mixed indicator to shorten the discoloration domain and improve discoloured sharpness. Precipitation titration adsorption indicator, if use nitrate thorium titration batch ions.
Storage: This product should be preservation in a sealed cool dry place.