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<p>[QUOTE=&quot;Ancient Aussie, post: 2513733, member: 80147&quot;]This is the mixture and info sheet I went of, trying to save the patina as soon as possible but alas, green water almost from the start.</p><p>Sodium Sesquicarbonate</p><p>Place the coins in a glass container and fill with a 5% solution of sodium sesquicarbonate. Let them soak for about 14 days, replace the solution, and soak for another 14 days. Then, place the coin in distilled water for about a week. </p><p>Don&#039;t have sodium sesquicarbonatelying around? You can make it with equal molar amounts of sodium carbonate (also called soda ash) and sodium bicarbonate (yes, you know what that is). For example, a 5% molal solution would be 10.6g of carbonate and 8.4g of bicarbonate in 100ml of water.</p><p>A 5% solution WILL REMOVE any &quot;patina&quot; on the coin! If there is an exceptionally aesthetic &quot;patina&quot; to be preserved, try a 1% or 2% solution. Be warned, though, that it will take three times as long, and has a higher risk of being ineffective.</p><p>The Beauty of a Green Patina … Can be completely stripped off through cleaning![/QUOTE]</p><p><br /></p>

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