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<p>[QUOTE=&quot;desertgem, post: 1188020, member: 15199&quot;]Red copper can change to RB to Brown over time due to the effects of sulfur and chemicals in the air. Until the last 50 years or so, little effort was taken to prevent this, although some was taken to try and reverse it, which can not easily be done in an undetectable way. If you have a red copper cent and live in an area with little smog, coal burning devices, etc., the red will last longer than not. In a good TPG slab, or a hard plastic snap holder or cointain, longer. If in an intercept or other preventive chemical reactant removing sulfur compounds, longer still. If in a mylar flip, heat sealed, or in a vacuum zip lock bag, with no leaks, probably longer than the average life span.Slabs can be put into these bags also.</p><p><br /></p><p>Turning brown is not due to the copper itself, it is due to the effects of contaminants on the copper. Prevent these from reaching the surface and it will stay red a long time. IMO.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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