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<p>[QUOTE=&quot;desertgem, post: 1671837, member: 15199&quot;]There are many factors involved, but if the coin has no corrosion loci ( points) already started, and little or no moisture, normal sunlight can not cause the production of photo reactive substances. However if the coin has been heavily dipped in acid solution, and not well rinsed, or if corrosion/toning ( what ever you want to call it) is already present, intense light or normal light over a long period can intensify the effect ( why many put coins they wish to tone in bright sunlight). Also, there is some inference that high silver content coins such as ASE, etc. can be exposed to a chemical in the mint and can show up much later with &quot;milk spots&quot; similar in coloration to silver halides, but I don&#039;t think anyone has correlated this effect with storage mechanism, such as very low moisture and/or sunlight. Much of my answer is speculative, but feasible IMO.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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