The classes I took were on a Nortel Minor I believe and we only did boro; that flame was unbearable up close and painful from afar. At home I can just look at it but of course I don't (using Phillips BoroTruview3.0 glasses). I've played with the flow rate and warm up time, no change.
Since I can melt the heavier boro rods and stiffer colors I can continue on my learning curve but at some point I will want the Scorpion's outer fire and I doubt I can get much out of it with the EX-20.
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