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<p>[QUOTE=&quot;Conder101, post: 1300999, member: 66&quot;]Needs to be quantified.&nbsp; how much loss are we talking about? Micrograms, nanograms less?&nbsp; How much was lost just from the flow of water over the samples?&nbsp; If there hadn&#039;t been a flow of water to carry those atoms of metal that the occasional UV photon brokeloose away would there have been any metal loss?&nbsp; What was the intensity of the UV radiation?&nbsp; Without a lot more information this is meaningless.</p><p><br /></p><p>Oh and put a layer of glass in front of the coins and you cut the UV intensity significantly.</p><p><br /></p><p><br /></p><p>This is true, but the heating effect from indirect light is probably fairly insignificant.&nbsp; The heating effect from you standing there looking at them would probably be greater.&nbsp; A much greater heating effect would come from whatever direct sunlight falling on other items is heating them and raising the temperature in the room.&nbsp; This is offset by the room&#039;s temperature controls.</p><p><br /></p><p><br /></p><p>Intense light can have an effect on metals, typically by knocking off electrons and maybe once in a great while even displacing an atom.&nbsp; An electrically unbalanced atom might be more likely to react with an atom from the atmosphere.&nbsp; I don&#039;t think you would any problem with indirect lighting though.</p><p><br /></p><p><br /></p><p>Indirect lighting, temperature and humidity controlled, coins encapsulated, glass fronted display case, I&#039;d say decades if not centuries.&nbsp; Probably more at risk from the long term degradation of the plastic, paper, and inks inside the holder (Depending on the holder generation)&nbsp; If the coin is stable in the holder then centuries would not surprise me.[/QUOTE]</p><p><br /></p>

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