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<p>[QUOTE=&quot;Conder101, post: 616094, member: 66&quot;]It happens every year.&nbsp; The way it happens at the planchet manufacturers is that when the zinc planchets are plated some of the zinc does dissolve into the plating solution.&nbsp; Over time the zinc content of the solution keeps increasing.&nbsp; Then as the planchets are plated both copper AND zinc come out of solution and deposit on the surface.&nbsp; A mixture of copper and zinc is brass.&nbsp; The color of the brass varies depending on the ratio of copper and zinc on the surfaces.&nbsp; The more zinc the more yellow the color.&nbsp; Eventually they notice that the planchets are coming out too yellow and they change the plating solution.[/QUOTE]</p><p><br /></p>

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