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How is hydrogen peroxide is used to rest...

How is hydrogen peroxide is used to restore the white colour of old paintings.

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Hydrogen peroxide is used to restore the white colour which was lost due to the reaction of hydrogen sulphide in air with the white pigment `Pb_(3)(OH)_(2)(CO_(3))_(2)` to form black colored lead sulphide (PbS).
Hydrogen peroxide oxidises black coloured lead sulphide to white coloured lead sulphate, there by restoring the colour.
`Pbs+4H_(2)O_(2)toPbSO_(4)+4H_(2)O`
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