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<p>[QUOTE=&quot;desertgem, post: 8054056, member: 15199&quot;]Temperature and the amount of Oxygen that can be bonded by the copper can alter the color. Use a mini-butane torch and you can make a Black pearl on Red ( if you are careful and practice)</p><p><br /></p><p><br /></p><p>There are two oxides of copper.</p><p><br /></p><ul> <li>Copper(I) oxide (cuprous oxide, Cu2O) , red color forms below 300 C</li> <li>Copper(II) oxide (cupric oxide, CuO), brown,black oxide that forms above 300 C</li> </ul><p>Continued heating to 1326 C results in melting and at 2000C, it boils.</p><p><br /></p><p>Black and red copper oxides</p><p><br /></p><p><br /></p><p><br /></p><p><img src="https://qph.fs.quoracdn.net/main-qimg-7cf9f3584c8c67038aee1a76276486bc" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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