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<p>[QUOTE=&quot;gsimonel, post: 8170086, member: 82549&quot;]I&#039;m fairly certain that spot is bronze disease. Left untreated, it will eventually destroy your coin (although it might take 20 years to do so). Fortunately, it is inexpensive and easy to treat.</p><p><br /></p><p>Here is what I wrote in an earlier thread:</p><p><i><br /></i></p><p><i>Buy a gallon of DW </i>[distilled water]<i> from your local grocery. Brush off as much BD as you can from the afflicted coin. Use a toothpick or brass bristle brush to scrape around the affected area. Place it in a cup for 1 or 2 days, then take it out and dry it off with a rag. Replace the old DW in the cup with fresh DW and repeat this process. Do this repeatedly for 2-3 weeks. Then dry the coin off and set it unsealed somewhere where you will see it often. Check it every day or so to make sure the BD does not return. If, after 1-2 months, you do not see any more BD, your coin is cured, and you can treat it like you would any other ancient coin. If it does come back then you would need to repeat this regimen.</i></p><p><i><br /></i></p><p><i>I have treated many coins this way. About 10% of them had the BD return and required a second treatment. I&#039;ve never had to treat a coin a third time.</i>[/QUOTE]</p><p><br /></p>

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