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<p>[QUOTE=&quot;Oldhoopster, post: 2970322, member: 84179&quot;]I made a phase diagram rookie mistake and was commenting on a composition that was 75% Zinc.&nbsp; The Bath Metal is 75% Copper and 25% zinc, which is on the left side of the diagram.&nbsp; The alloy looks pretty stable in that region to well over 900C.</p><p><br /></p><p>Based on this, I would think the bubbles and raised areas are more likely to be due to&nbsp; inconsistencies in the initial melt than due to reheating of the planchets prior to striking.[/QUOTE]</p><p><br /></p>

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