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<p>[QUOTE=&quot;romismatist, post: 8606773, member: 44106&quot;]Sodium sesquicarbonate is a weak base, like sodium carbonate. You want a weak base so the reaction occurs slowly over time and doesn&#039;t &quot;burn&quot; the coin. I don&#039;t think sodium sesquicarbonate is readily available in grocery stores or pharmacies but you can buy it on E-Bay or online chemical retail outlets. It is present as an ingredient in some products you can find in grocery stores though, so not hazardous.</p><p><br /></p><p>The other alternative is benzotriazole, which the museums often use, but it&#039;s a known carcinogen and is very difficult to handle. I&#039;ve stuck with sodium sesquicarbonate and have been able to neutralize bronze disease on several coins I&#039;ve diagnosed it in. Like [USER=110226]@robinjojo[/USER] says, it is a long process, with repeated treatment, taking weeks or even months, but it&#039;s worth it in the end.[/QUOTE]</p><p><br /></p>

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