Original Message:   Hard to tell right away....

The first time I encountered this was a purchase of vintage beads almost 20 years ago. I made necklaces with them. It took YEARS for the coating to chip off! (Opaque white glass underneath.) I had to restring some customers' necklaces for years after. So even if you etch them, there's no guarantee the coating won't fail later. I would imagine tumbling would simply remove the surface of the coating and make it even more vulnerable to peeling/chipping off. Copyright 2024 All rights reserved by Bead Collector Network and its users

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