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How the colour of lead paintings is restored  by hydrogen peroxide?

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How the colour of lead paintings is restored by hydrogen peroxide?

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Hydrogen peroxide oxidizes lead sulphide to lead sulphate

Hydrogen peroxide oxidizes

Lead paintings get blackened due to formation of lead suiphide by the action of H2S present in air. On treatment with H2O2  lead sulphide (black) is convertedto lead sulphate (white) and thus colour of lead paintings is restored.

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