Steve,
From your description, I would guess that the green material is a grease,
probably a die lubricant used in the lead trimming operation, that has
picked up copper over time.  The copper turns green.  Running some FTIR, as
Bev suggests, would give you some insight on the nature of the grease.
Doing  a SEM/EDX would tell you if you have copper in the sample.  You will
also likely see chloride and sulfur, common to lubricants.

Doug

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