Ah! I understand!I was surprised at your question! I went to see my beads and indeed, I see the twisted cane decoration is not out the surface. There is something that seems to me suspicious in your beads: the wear seems lumpy to me. On Venetian beads that have been worn, the wear never looks like that, it is smooth. Here the surface of the glass seems attacked, destroyed. Would not they have been passed in an acid? It's curious.
Best regards,
Christiane