did you use an intense, localized flame or a broad, annealing
type of flame?
Seems like a good question, actually. I used my oxy-acetylene
Little Torch with a number four tip, and a medium sized, reducing
flame. So, depending on what torch you are using..... To me, I'd
categorize it as a small, intense, local, very hot, neutral flame.
FWIW, I used commercially made (Griffith) Prip's Flux.
I'd love to do some more experimenting, but I promised my mom I'd go
to Chile with her, and we do have those plane tickets, so fusing
play time will have to wait. It will be interesting to hear of
anybody else's experiences.