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Copper is the base for the color green in pottery glazes. Compounds such as copper sulfates can be made in a test tube by heating sulfur powder mixed with copper powder(preferable) or filings. Crushing the residual compound in the test tube and adding it to a glaze base should work.

Note: I have also used of all things, MiracleGro. It too has a copper compound in it and it has been used as a pottery glaze. I learned of this technique on YouTube. It does work and can be safely used. It also does not produce sulfurous vapors as in the first formulation.

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15y ago

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