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<p>[QUOTE=&quot;COCollector, post: 2258841, member: 76108&quot;]Instead, swimming-pool acid (aka <b><a href="https://www.discountpoolmart.com/product_info.php/liquid-chlorine-and-acid/hasa-muriatic-hydrochloric-liquid-acid-24h-p-3142?osCsid=5e9b4246829c3eddffbffdbb0804ebc5" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.discountpoolmart.com/product_info.php/liquid-chlorine-and-acid/hasa-muriatic-hydrochloric-liquid-acid-24h-p-3142?osCsid=5e9b4246829c3eddffbffdbb0804ebc5" rel="nofollow">Muriatic Acid</a></b>) should work.</p><p><br /></p><p>Use the stuff that&#039;s 31% hydrochloric acid (if you can find it): <a href="https://www.discountpoolmart.com/product_info.php/liquid-chlorine-and-acid/hasa-muriatic-hydrochloric-liquid-acid-24h-p-3142?osCsid=5e9b4246829c3eddffbffdbb0804ebc5" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.discountpoolmart.com/product_info.php/liquid-chlorine-and-acid/hasa-muriatic-hydrochloric-liquid-acid-24h-p-3142?osCsid=5e9b4246829c3eddffbffdbb0804ebc5" rel="nofollow"><span style="color: #0066cc">https://www.discountpoolmart.com/product_info.php/liquid-chlorine-and-acid/hasa-muriatic-hydrochloric-liquid-acid-24h-p-3142?osCsid=5e9b4246829c3eddffbffdbb0804ebc5</span></a></p><p><br /></p><p>But for my chem students, I always soaked the scraped-edge penny overnight in 6M <b><i>reagent-grade</i></b> hydrochloric acid. Very clean.</p><p><br /></p><p>And it doesn&#039;t take much acid. A full shot-glass is plenty.[/QUOTE]</p><p><br /></p>

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