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

1.	How is hydrogen peroxide is used to restore the white colour of old paintings.
Answer» SOLUTION :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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