1. Appearance Black powder freefrom dirt and anyforeign material2. Density (g I em' ) 1.25 -1 .503. Solubility(i) In Distilled water 65 % (Minimum)(ii) In Dimethyl Sulphoxide 30 % (Minimum)4. pH of 2% (w/v) solution in 8.5 (Minimum)distilled water at 24卤2路C5. Moisture Content , percent by 10.0 (Maximum)mass