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<p>[QUOTE=&quot;-jeffB, post: 7636625, member: 27832&quot;]Huh. What I remembered from my very old chemistry days was that Reagent was generally <i>more</i> pure than USP, at least for most chemicals. USP wasn&#039;t as strict about impurities that had no health impact, whereas Reagent limited all impurities, since different impurities could have an impact on different reactions.</p><p><br /></p><p>Spectroscopic grade tends to be even more pure, as I remember, and I guess there are higher and more specialized grades as well.</p><p><br /></p><p><a href="https://www.labmanager.com/business-management/the-seven-most-common-grades-for-chemicals-and-reagents-2655" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.labmanager.com/business-management/the-seven-most-common-grades-for-chemicals-and-reagents-2655" rel="nofollow">Here&#039;s a description of <i>seven</i> common grades</a>, with Reagent at the top.</p><p><br /></p><p><a href="https://www.avantorsciences.com/pages/en/grade-definitions" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.avantorsciences.com/pages/en/grade-definitions" rel="nofollow">Here&#039;s a list that includes more specialized grades</a>, mostly aimed at things I&#039;ll probably never get to do (high-precision analysis, biotech).</p><p><br /></p><p><br /></p><p>From what I&#039;ve seen, that grade is for semiconductor processing, where we&#039;re getting very close to doling out individual atoms. It&#039;s really, really, <i>really</i> overkill for coins, unless you&#039;re going to handle your coins only in positive-pressure clean rooms while wearing a bunny suit... <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie11" alt=":rolleyes:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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