eat up the copper with the torch to a high temperature (until the metal is red hot). – Quench immediately in a boiling water and salt solution (Salt/water solution: 3 tablespoons salt to 3 cups water).
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oh the colors of copper patina (verdigris) This would be great to copy on a basement floor. Wonder if sprinkling real copper shavings and dust on top of freshly poured floor and then treat it with acid would work?