Old lead paintings often turn dark or black over time due to the atmospheric forming lead sulphide (). The original white colour of the painting can be meticulously restored using a dilute solution of

Question

Old lead paintings often turn dark or black over time due to the atmospheric $H_2S$ forming lead sulphide ($PbS$). The original white colour of the painting can be meticulously restored using a dilute solution of $H_2O_2$. What is the exact chemical role of $H_2O_2$ in this restoration process?

Prashant Kotian · Accepted Answer

Correct answer: B. Blackened statues and paintings are coated with (lead sulphide). acts as a strong oxidizing agent, oxidizing the black to white (lead sulphate), thereby safely restoring the painting's original white colour without destroying the underlying pigment. The reaction is: .

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