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<p>[QUOTE=&quot;calcol, post: 2564624, member: 77639&quot;]Putting a bit of sacrificial metal, usually copper, in a container of coins assumes the reactive gas molecules, like hydrogen sulfide will go the sacrificial metal first.&nbsp; Bad assumption.&nbsp; The Intercept Tech containers completely surround the coins, so the nasty stuff has to contact the sacrificial material first.&nbsp; It&#039;s not just a matter of having sacrificial material near the coins, but to also consider geometry so that the sacrificial material gets hit first.</p><p><br /></p><p>Intercept Tech was developed by Lucent Technology (aka Bell Labs) to protect electronic components.&nbsp; Their patent descriptions can be easily found on the net.&nbsp; It consists of copper particles imbedded in a conductive carbon matrix.&nbsp; That&#039;s why the insides of the boxes are black.&nbsp; The effective reactive surface area is huge.&nbsp; Unless you store them in a really bad environment, they&#039;ll work for decades.&nbsp; There is no indicator to signal when they are exhausted. However, you can have small Intercept Tech boxes inside a larger one and a piece of copper foil (or pennies if you like) inside the larger but outside the smaller.&nbsp; When the copper starts changing color, replace all the boxes.&nbsp; Chances are you&#039;ll never have to do it.&nbsp; I don&#039;t bother with an indicator.&nbsp; The coins will outlast me in fine shape in their current boxes.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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