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<p>[QUOTE=&quot;davidh, post: 439143, member: 15062&quot;]You used to be able to buy little bottles of acid with an enclosed applicator specifically to raise the date on Buffalo Nickels and other coins.&nbsp; Vinegar is a weak acid and may do the same thing.&nbsp; Law enforcement does the same thing to guns to raise serial numbers that have been filed or ground off of firearms.&nbsp; This works because of the density difference between the date/serial number and the surrounding field.&nbsp; The acid attacks the two densities at different speeds and eats away the less dense area first, leaving the image of the number behind.[/QUOTE]</p><p><br /></p>

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