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<p>[QUOTE=&quot;Kentucky, post: 1309082, member: 33176&quot;]Me chemist too, Me splain,&nbsp; Absorption - taking water into the interior like a sponge.&nbsp; Adsorption - forming a surface layer of something through an attraction.&nbsp; Yes, everything in air containing moisture will adsorb some moisture.&nbsp; Now for my conjecture.&nbsp; Coins have a convoluted surface and excess moisture has a chance of collecting in the nooks and crannies.&nbsp; This moisture might not evaporate as rapidly and could possibly cause corrosion/toning/discolloration.&nbsp; Unlikely with gold, more likely but not really too bad with silver, copper has the most chance, not to mention aluminum.&nbsp; The acetone rinse would leavethe surface pristine and let it be hydrated naturally.[/QUOTE]</p><p><br /></p>

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