Description :
This product is white to pink crystal powder with the melting point 189.6～190.2℃ and the boiling point  284℃(begins to decompose).It will turn to purple when met with light or exposed in air.It is hardly soluble in benzene and chloroform.It is middle toxic and irritant.It is used to detect gold,copper, iron ,magnesium,vanadium,nitrite and cyanic acid salt.It is used in antioxygen, organic synthesis and photographic developer.This product should be sealed from light.