Vitamin C (Ascorbic Acid) CAS No.:50-81-7 Quality standards: USP26/BP2000/EP4/GP10/FCC4 Characteristics: white crystalline powder Identification: positive reaction Color of solution: BY7 max. Copper: 5ppm max. Heavy metal: 3ppm max. Iron: 2ppm max. Oxalic acid: 0.2% max. Sulphate ash (residue on ignition): 0.1% max. Specific optical rotation: +20.5 ~ +21.5 degrees Organic impurity: pass Assay: 99.0-100.0% Packing: 25kg/fiber drum ,or 25kg/carton,or according to customers?requirement. Certificate of Analysis: If needed, please fell free to contact us We look forward to receive yr Inquiries with Qty required , Destination , Mode of Shipment (Air /Sea ) Pls feel free to send us inquires as per yr requirments. Any other products interested by you are on request . we will try our best to source those materials at our competitive prices & good quality.