Red Copper Burned For A Long Time Will Black?

Red copper is pure copper, the surface of the black is copper oxide. Copper oxide can react with acids to dissolve, but red copper does not.

So you can wipe the surface with acid, or you can just soak it in acid and then rinse it off with water. Dilute sulfuric acid or dilute hydrochloric acid is best.

If you can not find vinegar can also be used, but because the concentration of vinegar is small (3%-5%) so the effect is not obvious, you can also use vinegar essence.

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