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Blackened oil painting can be restored i...

Blackened oil painting can be restored into original form by the action of

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Blackened oilpainting can be restored into original form by the action of

Blanked oil painting can restored with original from by the action 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.

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.

How Mineral fertility can be restored ?