Coring and capping with brass should be OK. The problem with silver glass is that sometime the 'silver' is something else (lead, zinc, etc) and it's hard to tell them apart without a spectrometer. I don't think that anyone would use lead for this, so I don't see a problem.
Robert
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Robert Simmons
(Former) Director for Bead Donations
Beads of Courage, Inc.
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