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<p>[QUOTE=&quot;Tom B, post: 1631074, member: 11854&quot;]One way this can be screwing with the coin is that if there is retained dirt, debris or gunk on the piece and then it is washed away by the acetone treatment it may leave a shadow behind that can be quite distracting.&nbsp; The dirt, debris or gunk need not be disolved by acetone, it can be simply mechanically loosened and removed by the treatment.&nbsp; In cases such as this, and on coinage that is not new, one can be left with spots of different colors or textures where the surfaces have been disturbed.&nbsp; This can make a coin nasty.[/QUOTE]</p><p><br /></p>

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