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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_2O_2toPbSO_4+4H_2O`
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