- Joined
- Jan 22, 2011
- Messages
- 8,031
It's an art, and one I have had only limited success with. I knew a guy who was an old hand at Crucible Metals who was a whiz at it. He tried to teach me, and part of it stuck. Color is a big part of of it, but the breakout of the sparks I think is very telling and maybe more important. You could still do pretty good, even with limited color vision, I believe.