Sodium Naphthionateis a greyish-white crystal. Ashen crystallization, turn into rose-colored gradually among air, very much easy to dissolve on ink, Do not dissolve it in the ethanol . Product this sulphurate but make by 1-naphthyl-amine , use as the intermedia of the azo dyes mainly.
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Notes:Put in dark,cold and air through place to prevent sun light