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<p>[QUOTE=&quot;Conder101, post: 293006, member: 66&quot;]Very good, that is pretty much exactly what it is.&nbsp; The plastic often carries a slight film of oil known as mold slip.&nbsp; It is a thin oil that is sprayed on the injection molds to keep the plastic from sticking to them.&nbsp; Ideally it should be washed off of the pieces, but that often doesn&#039;t happen.&nbsp; NGC slabs are well known for it.&nbsp; when the slab is assembled if the outer cover touches the inner piece of plastic you will often see an &quot;interference pattern &quot; around the contact point caused by the oil film[/QUOTE]</p><p><br /></p>

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