vitamin C item Test results Chinese pharmacopoeia 2000 Version Characteristic pass white crystalline powder Melting point 191.0 190-192 Specific rotation +20.5--+21.5 +21.0 Identificatiorpass pass Clarity&Colour of solution passA≤0.03 Residue on ignition 0.02% ≤0.1% Ferrite <2ppm ≤2ppm Copper <5ppm≤5ppm Heavy metals <3ppm ≤10ppm