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<p>[QUOTE=&quot;conpewter, post: 839764, member: 23236&quot;]Not sure if this is related, but seemed like it could be a factor</p><p><br /></p><p><b>Polishing</b></p><p><br /></p><p>&nbsp;A very fine powder of ferric oxide is known as <b>jeweler&#039;s rouge</b>, <b>red rouge</b>, or simply <b>rouge</b>. It is used to put the final polish on metallic <a href="http://en.wikipedia.org/wiki/Jewellery" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Jewellery" rel="nofollow">jewelry</a> and <a href="http://en.wikipedia.org/wiki/Lens_%28optics%29" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Lens_%28optics%29" rel="nofollow">lenses</a>, and historically as a <a href="http://en.wikipedia.org/wiki/Rouge_%28cosmetics%29" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Rouge_%28cosmetics%29" rel="nofollow">cosmetic</a>.</p><p>&nbsp;Rouge cuts more slowly than some modern polishes, such as <a href="http://en.wikipedia.org/wiki/Cerium%28IV%29_oxide" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Cerium%28IV%29_oxide" rel="nofollow">cerium(IV) oxide</a>, but is still used in optics fabrication and by jewelers for the superior finish it can produce. When polishing gold, the rouge slightly stains the gold, which contributes to the appearance of the finished piece. Rouge is sold as a powder, paste, laced on polishing cloths, or solid bar (with a <a href="http://en.wikipedia.org/wiki/Wax" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Wax" rel="nofollow">wax</a> or <a href="http://en.wikipedia.org/wiki/Petroleum" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Petroleum" rel="nofollow">grease</a> binder). Other polishing compounds are also often called &quot;rouge&quot;, even when they do not contain iron oxide. Jewelers remove the residual rouge on jewelry by use of <a href="http://en.wikipedia.org/wiki/Ultrasonic_cleaning" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Ultrasonic_cleaning" rel="nofollow">ultrasonic cleaning</a>.[/QUOTE]</p><p><br /></p>

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