Hiya blacksmith,
Welcome to the addiction. You've taken your first and possible fatal step into the wonderful world of melting glass. It's difficult to say precisely what's going on with what you've done. Are you using a hothead torch? I couldn't tell what kind of torch you were using with the mapp torch, but it's possible it's throwing out alot of soot, instead of burning clean. Wouldn't make much difference soldering a pipe, but wouldn't be so good on a bead. That would be my guess. Get a hothead torch. They aren't too expensive and are a great way to start.
Good luck.
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Running a Mirage
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