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<p>[QUOTE=&quot;Kevin Mader, post: 7498919, member: 106826&quot;]When the planchets are being blanked out of the sheets of Zinc, manufacturing materials are used to keep the tooling lubed extending the life of the die between sharpening.&nbsp; Normally, water soluble lubricants/oils are used as they are easiest to removed during the cleaning/rinsing process.&nbsp; If this oil isn&#039;t sufficiently removed, it can become problematic when the planchets are sent to the plater.&nbsp; During the plating operation, the plating might not bond with the zinc substrate in areas creating voids.&nbsp; Where the bond is weak, it can lift and separate from the substrate.&nbsp; If there is a split or a hole in that area, then the environment can take over, creating the eventual conditions to support the creation of hydrozincite.&nbsp; We tend to call that &#039;zinc rot&#039; around here.&nbsp; The substrate zinc is eventually consumed by the environmental conditions.&nbsp; Air and humidity are the key factors to creating the hydrozincite.&nbsp; Zincolns lost in the cupholder of a car, where cold drinks sweat and temperatures can get high, accelerate the road to destruction.</p><p><br /></p><p>You can see on your specimen that the issue is present on the obverse and reverse.&nbsp; Suggests a dirty bath before plating to me affecting both sides.[/QUOTE]</p><p><br /></p>

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