Description......................................................................................................................Orange red fine powder
Solubility.........................................................................................................................Freely soluble in water, soluble in ethanol ( 96 %)
Identification......................................................................................................................Passes tests
Appearance of solution...................................................................................................Passes test
Minimum Assay ( Spectrophotometric in Buffer pH 8.0, calculated on dried basis).......98 %
pH of 2% soln. in water......................................................................................................7.0 to 9.0
Absorption Maximum (in pH 8.0).....................................................................................490 - 492 nm
Absorptivity (A1% / 1cm at λ max; in pH 8.0,ondried substance)...............................Min. 1850
Sensitivity (as adsorption indicator).................................................................................To pass the test
