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<p>[QUOTE=&quot;Sallent, post: 3589110, member: 76194&quot;]You can leave it for longer. I know it sounds counterproductive because it&#039;s water, but distilled water undergoes a chemical reaction with the salts that are reacting with the metal to cause BD, and that reaction neutralizes the BD.</p><p><br /></p><p>I&#039;m not a chemist so I&#039;m sure someone else here can explain the chemical reaction process better for you than I ever could.</p><p><br /></p><p>As to how long is enough....not sure. I&#039;d say a week might be enough, though am sure someone else here might have better experience with what time period is the best. I&#039;ve only ever used the process on a few coins to remove dirt/grime, not treat actual BD, except for once. With BD, I only ever treated one coin, and I did a week of distilled waternafter manual removal of BD, followed by Verdicare. It was a very tiny spot of BD, and the coin has never suffered from it again.</p><p><br /></p><p>I do use Verdicare on all my coins since then, and have never had issues with BD.[/QUOTE]</p><p><br /></p>

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