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<p>[QUOTE=&quot;Just Carl, post: 793186, member: 4552&quot;]Almost all forms of light does not have any effect on metals. You could place a piece of Tin, Zinc, Copper, etc in the Sun, on a table with every type of lighting possible and it would still be the same, no reaction. Light does not effect metals EXCEPT, where such lighting creates heat therefore increasing chemical reactions with gasses such as Oxygen. </p><p>You must realize that it is really difficult to find a container that is completely air tight. Regardless of what the container is, eventually some type of gass will enter and many forms of light generate heat and that would or could increase reactions with a gass and the metal of a coin. </p><p>As a general rule you could bombard a coin with any type of lighting you could normally emit and nothing SHOULD happen just from the light itself. As you mentioned your actually discussing lighting. You should be aware though that the lighting you see is only a small, very small fraction of what is called light. Note that many types of lighting is not visable by us. If your type of lighting used generates a lot of heat, that heat in reality is primarily InfraRed radiation. Again, the heat could possibly increase reactions already under way due to the smallest amount of a gass inside the container with your coins.[/QUOTE]</p><p><br /></p>

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