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Appearance    White crystal
Solubility in ethanol    colourless and clear
Purity    >= 99.2 %
Melting point ℃    89-93 ℃
Moisture    =< 0.5 %
Residue on ignition %    =< 0.2 %
Heavy metals (as Pb)    =< 10 PPM
Arsenic    =< 1 PPM
Fe    =< 1 PPM