Maximum absorption wave-length ¦Ë£¨PH8.0£©:490-493 nm

Mass-absorption coefficient ¦Ë£¨PH8.0£©L/cm¡¤g:  200 min.

Ethanol soluble test: qualified

Sensitive test: qualified

Loss on drying: 5.0%max

Residue on ignition£¨as sulfate£©: 0.3%max