... all gesso, 500 °C above decomposition. 1 g soluble in 0.6 ml water, 2.5 ml glycerin, not soluble in ... .5122.60ZnSO4·H2O ≥% ZnSO4·7H2O ≥%98.098.299.099.2Insolubles ≤%0.0200.0200.0200.020PH ( 50g /L ) ≥%4.04.03.03 ... .200.20Pb ≤%0.0020.0020.0010.001Fe ≤%0.0080.0070.0030.003Mn ≤%0.010.010.0050.005Cd≤%0.0020.0020.0010.001Cu≤%0.001-------0.002——Packing ...