I am using an Acetyline Smith torch.All of the fittings are correct
for the B tank.Only Acetyline, no oxygen. Even though the flame
should be blue, I am getting an orangy( the cone is bluish) colored
flame. I tried changing the fittings with another Jewelers(teacher)
torch to try and Isolate the problem.I thought it was solved because
the flame was blue,now its orangy again.What makes the flame blue as
opposed to orange?