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<p>[QUOTE=&quot;GDJMSP, post: 3435396, member: 112&quot;]The thing that Kentucky left out of his explanation is that water exist in the air in the form of water vapor. And since the hydrogen chloride gas goes into the air and mixes with that water vapor the hydrochloric acid is formed when it condenses on the coins.</p><p><br /></p><p>As for color, PVC residue changes color. When it&#039;s first deposited on the coins it is clear and for all intents and purposes invisible to the naked eye. But with time the color changes, and changes continuously. It can have a white, yellow, brown, green, and eventually even black cast to it. It all depends on how long it&#039;s been there and the specific environment where the coins are located. </p><p><br /></p><p><br /></p><p><br /></p><p>I cannot speak as to what is or is not available in your country. But here in the US pure acetone is readily available in any paint store or hardware store. And it is very inexpensive.[/QUOTE]</p><p><br /></p>

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