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<p>[QUOTE=&quot;HandsomeToad, post: 372582, member: 12965&quot;]When did they stop sandblasting and start using chemicals?</p><p>&nbsp;</p><p>WikiPedia excerpt:</p><p>&nbsp;</p><p><i>&quot;The dies for making modern </i><a href="http://en.wikipedia.org/wiki/U.S." target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/U.S." rel="nofollow"><u><span style="color: #0066cc"><i>U.S.</i></span></u></a><i> proof coins are often treated with chemicals to make certain parts of the design take on a </i><a href="http://en.wikipedia.org/wiki/Frost" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Frost" rel="nofollow"><u><span style="color: #0066cc"><i>frosted</i></span></u></a><i> appearance, with the polished fields taking on a mirror finish. Several other methods have been used in the past to achieve this effect, including sand blasting the dies, and matte proofs. Proof coins of the early 1800s even appear to be scratched, but it was part of the production process.&quot;</i></p><p>&nbsp;</p><p>&nbsp;</p><p>Ribbit&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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