Message:

<p>[QUOTE=&quot;GDJMSP, post: 3228353, member: 112&quot;]Sometimes, stress sometimes, a coin may have a whitish cast to it after having been rinsed in acetone. But there&#039;s several different scenarios involved that can cause this - and it can be due to any of them. Sometimes it contaminants that get dissolved in the acetone and remain on the coin when you pull it out. Yeah the acetone evaporates but the contaminants don&#039;t and they can cause the whitish cast. Using at least 3 bowls of clean, unused, acetone and rinsing in each will solve this problem. </p><p><br /></p><p>Other times it&#039;s because not everything on the coin got removed in the first go round. </p><p><br /></p><p>And yet at other times, there are no contaminants remaining because the coin was rinsed correctly, everything did get removed, and yet the coin still has a whitish cast to it. Typically this happens with silver coins. (but like I said above, this does NOT always happen, only sometimes) So what causes it in this case ? The same thing Jim mentioned above - the acetone removes all moisture. </p><p><br /></p><p>Put some acetone on the skin of your arm, you&#039;ll see the skin get a whitish cast to it when the acetone evaporates. This is because the acetone has removed surface moisture and oils from your skin. But wet your finger and rub it over the white spot - and the white spot will disappear and not come back - because moisture has been returned to the skin.</p><p><br /></p><p>Same kind of thing can happen with some coins. But here&#039;s the thing. Leave the coin alone for a few days exposed to the air and the whitish cast will disappear. Why ? Because moisture has been returned to the coin from the humidity in the air. Or, give the coin a final rinse in distilled water, and then it dry properly, and it will never have that whitish cast to it. (And yeah, I know your skin and a coin are not the same, I&#039;m merely using it as an illustration because of the similar result.)</p><p><br /></p><p>Some argue against this procedure saying moisture is bad for the coin. But if the coin is dried properly after the final rinse in distilled water then the coin has no more moisture on it than it gets from the air to begin with. So there is absolutely no harm done to the coin from this final rinse in distilled water. Nor is there any additional moisture. The coin will be as dry as it would be normally.</p><p><br /></p><p>Those who argue against this idea then say why do it if it&#039;s going to get the moisture from the air anyway eventually ? Well, here&#039;s why. Just like nature hates a vacuum, nature also hates desiccation - a total lack of moisture. About the only way I can explain it is that when all moisture is removed it kind of rushes back to the coin - taking any contaminants in the air with it - and they stick to the coin. But if the moisture is already there - it doesn&#039;t happen. And since the distilled water is clean there are no contaminants sticking to the coin. And you can seal it up in its holder being as clean as it can get.</p><p><br /></p><p>That&#039;s about the best you can hope for.[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in