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<p>[QUOTE="calcol, post: 3098376, member: 77639"]Chances are your tap water has fairly low mineral content (say, compared to sea water), so its density is close to distilled water. I'd use distilled water; it's cheap and won't have much beyond H2O in it to react with the coins.</p><p><br /></p><p>With ancient coins, it's possible to have dirt or mineral encrustation in crevices, etc. that dissolves or goes into suspension in water. After the coin has had its dunking and is dry, weigh it again in air to check. If it's lost weight, use the lower value for your calculations. If it's gained weight, there is probably still some water in cracks or crevices. More drying in a warm place is needed.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>
[QUOTE="calcol, post: 3098376, member: 77639"]Chances are your tap water has fairly low mineral content (say, compared to sea water), so its density is close to distilled water. I'd use distilled water; it's cheap and won't have much beyond H2O in it to react with the coins. With ancient coins, it's possible to have dirt or mineral encrustation in crevices, etc. that dissolves or goes into suspension in water. After the coin has had its dunking and is dry, weigh it again in air to check. If it's lost weight, use the lower value for your calculations. If it's gained weight, there is probably still some water in cracks or crevices. More drying in a warm place is needed. Cal[/QUOTE]
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