Originally Posted by
JohnDThompson
I agree that didynium lenses are nice, especially with silver where they help highlight the very first pale red when the joint is up to temperature. I still found the gasflux flame too bright with didynium, and used No. 3 green lens.
And sodium produces a yellow flame. It's the boron in the boric acid flux that produces the characteristic green flame:
Flame Tests
John- Thanks for the correction. I was just rehashing what I read in the past on forums. But my comments about the Didymium glasses helping with gas fluxed flames is from my experience. Andy