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<p>[QUOTE=&quot;bqcoins, post: 2009936, member: 5036&quot;]Vinegar should never be used as a cleaning agent or a dipping agent due to the acidity of it. Vinegar, especially cider vinegar, is actually used by many people to return the date and other details to dateless buffalo nickels. Because vinegar is a weak acid it eats away at the copper content of the coin, which is 25% of the makeup in the case of the nickel, and leaves the nickel alone. This helps to reveal the date on the coin just like nic-a-date would, except that as it affects the entire coin through immersion it doesn&#039;t leave the spot over the date that show where it was applied, but it will turn the coin a uniform dull gray. As it eats away the copper the vinegar turns a deep green to green-blue, the water also starts to evaporate from it further concentrating the vinegar. If not careful this color change and concentration change can actually stain the coin or pit it more deeply than just restoring the date.[/QUOTE]</p><p><br /></p>

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