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<p>[QUOTE=&quot;rmpsrpms, post: 1753803, member: 31773&quot;]As long as the moisture level is kept reasonably low, ie indoor residential dry conditions which would typically be 40-70% RH, and no airflow is allowed to occur over the coin, a red cent will stay red indefinitely and silver coins will maintain their color. It is active airflow and condensing or near-condensing atmospheres that damage coins. I&#039;ve run a 20-year experiment where I placed a fresh red cent in a piggy bank (old screw-together metal type) along with other BU bronze and silver, as well as circulated bronze and silver coins. I check on the progress every year of so and so far I see no change in color.[/QUOTE]</p><p><br /></p>

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