Message:

<p>[QUOTE=&quot;desertgem, post: 1183046, member: 15199&quot;]Slabs help, but aren&#039;t good enough on their own , even sonic sealed, they are not water or air tight. </p><p><br /></p><p>Corrosion/toning can be caused by&nbsp; Moisture ( water ) , air ( containing sulfur or other corrosive chemicals), contact with electrolysis causing substances, and unusually energetic light such as bright sun, or UV.</p><p><br /></p><p>Most is caused by the first 2, the other 2 very seldom if not intentional.</p><p><br /></p><p>Intercept technology utilizes activated copper based material that will react with sulfur and other corrosive substances easier than the coin will, and thus &quot;reduce&quot; strongly the possibility of corrosion/toning of the coin. It doesn&#039;t eliminate moisture, nor is it &quot;forever&quot;. In serious atmosphere contamination, the active copper will become ineffective, in normal conditions~ decades. A dessicant&nbsp; chemical can absorb moisture, but it also is limited and may have to be recharged.</p><p><br /></p><p>Some have recommended using archival epoxy around the edge of the slab, but I feel this is not a good idea since it may be ugly and certainly almost impossible to remove. </p><p><br /></p><p>If one doesn&#039;t mind the appearance, one of the best is to put the slab into a food quality zip lock bag ( with or without dessicant ), squeeze the air out, and zipping it shut. If one is really paranoid about the zipper leaking, fold it over and tape it to the bag. Change bag if it becomes worn. IMO.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in