Indicator methylene blue (C16H18ClN3S.xH2O).
Main substance: minimum 96%.
Soluble in water, alcohol, acetic acid, glycerin and chloroform. Insoluble in ether.
Melting temperature: 180o.
Lambda-max (UV-Vis): 662-666nm (H2O).
Hazard statements:
- H302;
- P264-P270-P301+P312+P330-P501. 
