Saltwater had its way with this find.
90% silver 10% copper deteriorating at different rates.
Sometimes there is just not much you can do.
After a good long soak in freshwater ..this coin started coming apart as it dried.
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I have seen coins even worse than that come out of the Loxahatchee River along the site of Ft. Jupiter. However, lead survived. Both in the water and even on dry land, buttons were destroyed by high alkaline soil. Of course, it is that way inland at Jupiter, Florida because the area once opened to the sea in prehistoric times and the Lox river basin was actually a bay. Along Fort Jupiter was an ancient beach.. Hence, one can find that the salty soil is toxic to military buttons, even two to three miles west of the modern beach.