My first try with a coal forge gave me a weird, glassy slag on the metal.

I was working on a simple leaf keychain and the surface came out looking like it had a weird, shiny skin. I think my fire was too deep and I let the piece sit in the reducing zone for too long. Anyone know how to fix this for next time?

2 comments

2 Comments

willow_martin23d ago

Check your fire depth and keep the work moving. That glassy slag is scale fusing back onto the steel from too much time in the reducing zone. A shallower, wider fire gives you better control.

gonzalez.vera23d ago

Actually, that glassy look is more likely from silica in the fuel or refractory lining (it's a flux). Still, your fire advice is spot on for control.