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<p>[QUOTE=&quot;desertgem, post: 3233682, member: 15199&quot;]You don&#039;t have to open up a slab to gas it. In a chamber , even with a small vacuum pump you can draw the air out of the slab, insert your gas mix through a port and release it into the chamber and region of the coin, it will be drawn into the slab,then use your technique, Simple science.[/QUOTE]</p><p><br /></p>

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