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<p>[QUOTE=&quot;Publius2, post: 7774285, member: 105571&quot;]Yes, elevated temperatures can damage your coins and the holders in which they reside and what happens to the holder can have an effect upon the coin.</p><p><br /></p><p>First:&nbsp; Obviously temperatures in the 110&#039;s and up can warp plastics, particularly if they have been constructed with residual, unrelieved stresses.</p><p><br /></p><p>Second:&nbsp; Almost all plastic materials outgas some of their chemical constituents.&nbsp; Think of what your new car smells like when you open the closed door on a hot day.&nbsp; That odor is almost entirely comprised of the chemicals in the carpet, fabric, vinyl and foam that makes up your car&#039;s interior.&nbsp; And if you left the remains of a cheeseburger in there, that too.&nbsp; And these materials outgas faster and more voluminously in higher temperatures.&nbsp; </p><p><br /></p><p>Third:&nbsp; Corrosion for most common metals doubles with every 10 degree F rise above ambient temperature (~68F).&nbsp; So, if there is some corrosion on your coin, no matter how slight, then raising the temperature will accelerate that corrosion rate.&nbsp; And remember that all toning and haze on a coin is just corrosion.</p><p><br /></p><p>Fourth:&nbsp; Mix accelerated corrosion from temperature with outgassed chemicals from holders and the mix might range anywhere from benign to toxic for your coins.</p><p><br /></p><p>Conclusion:&nbsp; As a general rule, you should not subject your coins, no matter how they are housed, to extremes of temperature and humidity for any length of time.&nbsp; Unfortunately, no one can tell you what the boundary conditions might be so you just have to judge conservatively.[/QUOTE]</p><p><br /></p>

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