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<p>[QUOTE=&quot;desertgem, post: 697379, member: 15199&quot;]Well I don&#039;t for sure, but the odds should be similar to&nbsp; an Intercept(tm) type of solution and somewhat better as they are replaceable. If the owner doesn&#039;t recognize that the sacrificial coins are changing and replace them, then the other coins can be affected. Raw surface metal reacts more actively with sulfur and oxygen than coins with a patina; even modern copper after a few days has a thin protective patina on it. Some reaction could occur with the &quot;good&quot; coins, but if the effect is reduced by 90%, it has done a good job. Ziplock bags would be as good by themselves, but I like to have some coins in albums and 2x2 boxes to admire and play with them. </p><p><br /></p><p>Try this. Take a few modern change cents that are close to BU, scrub them well till bright and shiny. Lay a few outside in a sheltered place, a few inside open to air, and a few in a ziplock bag. Compare them after 2 weeks and see if there is much difference. Results depend on your local air, but it will give you an idea of corrosion danger.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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