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<p>[QUOTE=&quot;daveydempsey, post: 2230521, member: 29458&quot;]Its probably been buried in a farmers field for centuries and found by a detectorist.</p><p>Over the centuries it will have come into contact with many chemicals that reside in the upper layers of the soil including&nbsp; chlorides, sulphates,&nbsp; calcium,sodium, magnesium and potassium not to mention anything that has washed past it after flooding and heavy snowfall and contamination from fertilizers and chemicals laid by the farmers.</p><p>Considering its history it looks fine to me.[/QUOTE]</p><p><br /></p>

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