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<p>[QUOTE=&quot;Just Carl, post: 106557, member: 4552&quot;]The mentioning of the contaminates in the air in the article by MrSpud is basically true. However the term corrode is misleading. Again, it&#039;s not the moisture in the air that effects coins, it is the contaminates. Therefore, in a bank, regardless of if they add moisture or take it out, I doubt they add contaminates to the air. A Normally decent A/C system condenses out such things in the air by the nature of condensation. I don&#039;t think a bank would&nbsp; add Sulfides, Nitrates, Chlorides into the air. Gold and Platinum coins are seldon effected by normal air born chemicals. Silver and Cupper are effected by S, Cl, NO3, NH3, which are commonly in the air in some areas of the country. Sulfur rich Coal buning in factories and power stations send SO and SO2 into the air where combining with H OH, normally called moisture as H2O, produce a mild acidic air which will turn copper coins or piping greenish. Actually individuals with pools using excessive amounts of Cl will find coins of Silver, Ag, unprotected around the house greatly effected forming AgCl. Households doing lots of cleaning with Amonia produce NH3 into the air which also cause damage to unprotected coins. The moisture is a solvent that brings the coin damaging material to the coin so protecting from moisture is important but again, it&#039;s not the moisture that does the damage. Like I have noted I have coins for well over 50 years, living in a very humid area and just freezer type bags have protected them thus far. However, who knows waht will happen in the next hundred years of so.[/QUOTE]</p><p><br /></p>

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