I'm in Australia, got my clip-ons locally - don't have a brand on them, try your local lampworking suppliers.
While you are at the first stage of learning, stay away from reactive color & thus don't need to worry about oxidizing or reducing flame.
Very simply, gas controls the flame size, oxygen changes flame temp, thus you should reduce the oxygen. Also, the hotest part of the flame is just outside the white/yellow candles, the further you move out from the torch, the cooler the temp, thus work further out from torch.
Peter
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