There's not really any way to prevent the trails on most opaque glass. On transparent, it's less of an issue. If you really don't want the trails, you'll have to encase your opaque with transparent and then do you silver wire. Conversely, if the trail isn't really bad, you can etch the bead and get rid of the trail that way.
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ESC
Soft glass on a Minor/concentrator since 1996
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