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<p>[QUOTE=&quot;Just Carl, post: 433890, member: 4552&quot;]That is true of the airation of NaCl in the air due to tubidity in the water from harsh air movements. However, that only last a short time due to the wieght of the Sodium. Partially mixes with the moisture in the air but settles out fast. </p><p>As to coins changing without a catalyst, metals do not need a catalyst when Oxydizing or reacting with other gasses in the air. However, that all depends on if you consider temperature a catalyst. For example SO or SO2 in the air readily mixes with H OH otherwise none as H2O, moisture or water. Chimically water is Hydrogen Hydroxide and that is why it so readily mixes with SO or SO2 to form a Sulfite or Sulfate Acidic substance H2SO4 is the worst of the substances to react with Copper. The Cupper in coins replaces the less molecular reactive Hydogen. In some areas this is so bad it is commonly known as Acid Rain and destroys almost everything. Numerous individuals in such areas constantly complain about their Copper pipes in thier house turning green. </p><p>Back to your coins in a Whitman Folder for 25 years. It is obvious that where they were stored there was little access to moisture and Oxygen. Expecially moisture. You mentioned FOLDER, not album. If you take one of those coins out of that folder you would see a shinny substance on the rear of the slot for the coin. This is glue from the manufacturing process. If moisture would have been sufficient in that area the glue would have probably stuck to the coins. This is why you see many coins with glues, lines, discolorations on the reverse side. </p><p>As to what is called Salt, NaCl, yes it would attack many coins. Remember that NaCl is an electrovalent compound and in the presence of moisture, the Chlorine would attack the Copper. </p><p>As you stated almost any of the present coin Albums, plastic rolls, 2x2&#039;s, etc that seal the coins from air, moisture, etc. are just as good as any. </p><p>There is constantly on these coin forums debates as to which is the best. My idea is that that is like asking which car is the best, which milk taste better, which lady shoud I marry, what stock should I invest in or who has the worst mother in law? All are to contraversial.[/QUOTE]</p><p><br /></p>

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