I was working with white the other day and thought I would try a new way of working it as I needed to cover a section of 15mm clear rod one and half inch long. I work on a Bethlehem bravo and I got both rings fired up showing a oxidizing flame then I just turned off the propane to the inner fire and adjusted the outer just a bit so the flames were not so reducing. I had no boiling. I took awhile as the flame was 'cooler', and once it was melted smooth and had some heat in it I turned on the inner propane.
I do not know much about working the torch this way and it does pop when I turn the inner propane back on, so know your torch and check with manufacture before trying this.
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