CriteriaTest requirement AppearanceDark violet powder Solubility 50 gms / lit. (min) Loss on drying 4%max. (w/w at 105 deg. C.) Shade & strengthComparable to standard (300%) Uv absorption0.750 abs at 548 nm of 0.001% w/v solution Ph of 2% w/v soln. 6.5 to 7.5 Water insoluble 0.5% max Dusting propertyYes / no (as per sample) Bulk density 0.65 to 0.70 gm/cc Confirm to standard Ir spectrum should match the stndard Alkaline med. (10 ph)Blue Acidic med. (2 ph)Green
