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<p>[QUOTE=&quot;John Burgess, post: 8422325, member: 105098&quot;]Copper(I) oxide or cuprous oxide with the formula Cu2O is what that is, it&#039;s toning. </p><p><br /></p><p>this type of toning happens in a water environment containing acid. </p><p>A pool, a fountain, acidic damp soil,&nbsp; something like that, and in there for a while but not long enough to corrode. </p><p><br /></p><p>if it were air, it would turn eventually green like the statue of liberty. that&#039;s&nbsp; Copper Oxide (CuO).</p><p><br /></p><p>Copper(II) oxide or cupric oxide is black, this is tenorite, and caused by fire. </p><p><br /></p><p>So, copper, if mostly dry and not put in a fire, goes from shiny copper to dark brown and eventually to green from the air. </p><p>if submerged, it goes brown to red.</p><p>if burned from 500-1500 degrees F,&nbsp; it goes brown to black. </p><p><br /></p><p><br /></p><p>the red can happen to dug coins, in wet, acidic soils also, doesn&#039;t need to be a pool or fountain or involve chlorine which does turn metals black (terminal toning) ,&nbsp; but it does need the wet acidic environment to get the red color.[/QUOTE]</p><p><br /></p>

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