9 H O restores the colour of old lead paintings blackened by

Last updated: 6/30/2023

9 H O restores the colour of old lead paintings blackened by the action of H S gas by 1 Converting PbO to Pb 2 Oxidising PbS to PbSO 3 Converting PbCO3 to Pb 4 Oxidising PbSO to PbSO