Sawdust and shavings.

[Mick Annick]

Including all stainless steel, brasses and aluminium, etc?

Fair point, I only play with mild steel!

 

[Greeves246]

Used to work at a coachbuilders in the 60s and there was a big sawdust burner that was the apprentices job to light first thing in winter. After filling the inner drum and removing the central tube it was normally enough to put a couple of pages of newspaper underneath and put a match to it. One day he had no joy so decided to pour a jar of what he thought was dirty turps in to help it along. He put the lid on and put a light Into the bottom. Unfortunately it was thinners not turps and the 3ft diameter lid hit the roof with an almighty bang.