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<p>[QUOTE=&quot;dwhiz, post: 2000371, member: 25416&quot;]It doesn&#039;t seem to be hollow Thanks for the reference</p><p><br /></p><p>Plating blisters are hollow.&nbsp; They look similar to, but should not be confused with, solid blisters pushed up by subsurface corrosion.&nbsp; Solid blisters are pushed up by gas under the expanding metal.&nbsp; Zinc corrosion (“zinc rot”) can be induced by contaminants trapped between the zinc core and the copper plating.&nbsp; A more common cause of zinc rot is the presence of a small perforation or tear in the copper plating.&nbsp; This allows oxygen and reactive compounds to reach the zinc core.[/QUOTE]</p><p><br /></p>

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