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<p>[QUOTE=&quot;desertgem, post: 13945729, member: 15199&quot;]It is to some degree determined by how many times the safe or other container or box is opened and the size of the cavity ( allows new air which you don&#039;t want replacing so when copper turns dull appearing , time to resand or replace ). Using the adhesive type you can stick to the inner surface of the safe if you wish&nbsp; or on the inside of the boxes. If you live in a desert like me, I only replace once a year if it reacted, so very seldom. </p><p>If you keep the house at low humidity, very seldom I would guess, but go by the color on the copper strip. If you want to put them into the box , container, etc. directly, get the non adhesive copper strips and sand both sides. The &quot;Intercept &quot; products at the coin stores are much more convenient and excellent, but cost per coin is much higher. IMO, Jim[/QUOTE]</p><p><br /></p>

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