... light yellow crystal powder, has cinnamon bark smell, m.p. =128°C, b.p. 300°C; slightly soluble in water, soluble in ethanol. Quality ... Quality First Quality Qualifier Assay/%, = 99.099.098.0Melting Range/°C, = 132132128Arsenic(As)/%, = 0.00030.00030.0003Heavy Metal(Pb)/%, = 0.0010 ...