Pollutant turned the painting black

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Lead pigments were used in water colour painting which turned black after prolonged to an air pollutant the original color was restored by using H2O2 which pollutant turned the painting black?

Reference no: EM13910135

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Pollutant turned the painting black : Lead pigments were used in water colour painting which turned black after prolonged to an air pollutant the original color was restored by using H2O2 which pollutant turned the painting black?
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