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Old lead paintings are generally washed ...

Old lead paintings are generally washed with dilute solution of `H_(2)O_(2)` in order to regain their colour. Why?

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Black colour in paintings is due to lead sulphide (PbS) . This is oxidised to lead sulphate hydrogen peroxide.
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Assertion:- The colour of old lead paintings can be retored by washing with dilute solution of H_(2)O_(2) Reason:- Black lead sulphide is oxidised by H_(2)O_(2) to white lead sulphate.

K_(a) of H_(2)O_(2) is of the order of

Assertion (A) : The colour of old lead painting can be restored by washing with dilute solution of H_2O_2 . Reason (R) : Black lead sulphide is oxidised by H_2O_2 to white lead suphate.

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