$H_2O_2$ restores the color of old lead paintings,blackened by the action of $H_2S$ gas by:
- AConverting $PbO_2$ to $Pb$
- BBy oxidising $PbS$ to $PbSO_4$
- CConverting $PbCO_3$ to $Pb$
- DOxidising $PbSO_3$ to $PbSO_4$
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