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<p>[QUOTE="rascal, post: 1269863, member: 29239"]The folks on here that said fire damage got it right in my opinion. We have a place where we burn our paper trash and I have picked many quarters and dimes out of the ashes with these raised bubbles in them. these clad type coins are made of three layers of metal , two super thin outer layers of copper nickel and a inner core of copper. when the coins are heated by getting burned with the trash they become softer and air bubbles builds up inside of the coins between the thin outer layers and the thick copper center core , this forces the thin outer layers to swell outwards and creates these raised bumps. sometimes a entire outer clad layer can come loose from the inner copper core. I suppose this same thing could be caused by other heat related things also .[/QUOTE]</p><p><br /></p>
[QUOTE="rascal, post: 1269863, member: 29239"]The folks on here that said fire damage got it right in my opinion. We have a place where we burn our paper trash and I have picked many quarters and dimes out of the ashes with these raised bubbles in them. these clad type coins are made of three layers of metal , two super thin outer layers of copper nickel and a inner core of copper. when the coins are heated by getting burned with the trash they become softer and air bubbles builds up inside of the coins between the thin outer layers and the thick copper center core , this forces the thin outer layers to swell outwards and creates these raised bumps. sometimes a entire outer clad layer can come loose from the inner copper core. I suppose this same thing could be caused by other heat related things also .[/QUOTE]
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