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Paint colors sourced from polluted streams

from Smithsonian

Toxic runoff from coal mines and commercial red and yellow paints have a common ingredient — ferric oxyhydroxides. Once the acidic ground water hits the air, the metals in it oxidize and the once-clear water turns yellow, orange, red or brown. To make paints of these colors, international companies basically mimic this reaction, adding chemicals to water tanks containing scrap metals. more

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