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<p>[QUOTE=&quot;ToughCOINS, post: 24699638, member: 20480&quot;]Think of the grease filled dies again . . . if those recessed are filled, where exactly does the metal go that was intended to fill those recesses.&nbsp; The grease actually exerts a force on the metal, and causes it to flow elsewhere. </p><p><br /></p><p>All materials possess a characteristic known as bulk modulus.&nbsp; It is the relative bulk modulus and the volume of two materials which determines how much each compresses to accommodate the other when the available volume is insufficient to accommodate both in uncompressed form. </p><p><br /></p><p>Since the rag is compressible only to a point, it is forced into the planchet, and the planchet metal in that area must take the path of least resistance to another destination.&nbsp; Lintmarks, occasionally seen in the fields of proof coins are another fine example of this.[/QUOTE]</p><p><br /></p>

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