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<p>[QUOTE=&quot;Just Carl, post: 432646, member: 4552&quot;]To start with the so called natural brown toning on Copper is NOT a barrier against corrosion. Secondly if you have salt in the air I&#039;d be carefull breathing it. The smell near an Ocean is not salt. It&#039;s to heavy to float in the air. </p><p>Not meaning to bore you but when bare Copper, Brass or Bronze is exposed to air, which contains Oxygen, it reacts to form Cu2O, Cuprus Oxide. Slightly redish brown. As the Cu2O is further exposed to Moisture, water or H OH, and Carbon Dioxide, CO2, in the air, a further reaction occurs forming Copper Carbonate [CuCO3-Cu(OH)2]. This starts as brownish green, continuing towards green. Now if you live in an area where coal has been burned or a steel mill, you may have SO or SO2 in the air. This too will react with Copper and form a Sulfite or Sulfate on the coins. </p><p>Corrosion, toning, staining, tarnishing are all terminologies of the effects of one substance on another. Coins do all of these. The main thing is to keep any coins away from other substances. Especially any gasses. </p><p>This means don&#039;t breath on them either. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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