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<p>[QUOTE=&quot;NorthKorea, post: 2762183, member: 29643&quot;]OP, grease is a solid, not a liquid. That&#039;s why, when it gets into the die the resulting impression on the devices is obscured/flattened. As a liquid, water would have some level of lubricity, which would mean, it would spread across the surface when compressed. Additionally, water is a low viscosity liquid, so it would be highly unlikely that it would be able to withstand the 60 tons of pressure and result in any discernible impact on the resulting coin.</p><p><br /></p><p><br /></p><p>Doug, I have to disagree with the basis for the theory, as it depends on the metal composition of the coin in question (Cu, Au, Ag versus Ni) and the coin press and ejection mechanism (Al, Mg versus various steels). I have a feeling that Cu coins would cool much faster than Ni coins, and when the coins are popped into the bin, they&#039;re coming into contact with high thermal conductivity products. It&#039;s possible that the 60 tons of pressure, over the surface area of the planchet, could, indeed, exceed the boiling point.</p><p><br /></p><p>I think the bigger concern is that the water wouldn&#039;t be exposed to the boiling temperature long enough for it to matter. (Basically, the water would flow away before it could boil off.)[/QUOTE]</p><p><br /></p>

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