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<p>[QUOTE=&quot;kaparthy, post: 63350, member: 57463&quot;]Baking soda definitely changes a coin&#039;s surfaces.&nbsp; </p><p><br /></p><p>Yes, there are ways to remove ground soil (real dirt; the stuff plants grow in) from a coin -- but baking soda is not it. </p><p><br /></p><p>&quot;Kitchen conservation&quot; ruins coins... and paper money... and medals... and stock certificates... and tokens ... and books ...</p><p><br /></p><p>One of the problems with numismatics is greed.&nbsp; Greed is both a positive and negative reinforcement.&nbsp; Getting the right item at the right price is the positive side.&nbsp; Being &quot;penny wise and pound foolish&quot; is the negative side.&nbsp; If a coin is worth conservation, then it is worth paying a professional to do it right.&nbsp; If it is not worth the money for professional conservation, then amateur conservation is not the answer.&nbsp; Just leave it alone.[/QUOTE]</p><p><br /></p>

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