Icumsa 45 rbu standardsrnorigin : europe eu origin.color : whiternpolarization at 20c : 99, 8 % minrnash content: 0.04% max.moisture : 0.04% maximumrnreducing: 0.05% maximum by weightrnpb content: 1 ppm maximumrnas content: 1 ppm. Maximumrncu content: 3 ppm. Maximumrnhpn staph aureus : nil (1000 mc)rnsubstance : crystalsrnsolubility : 100% dry and free flowingrnsediments : nonerngranulation : medium to finernmagnetic particles : 4 mg/kg maximumrnso2 content: 20 mg/kg maximum