I use lump charcoal when woking w/ high carbon steel.I have a regular coal fire in the forge.
I have 1/2 a 100lb dumb bell(let the laughter die down); put the char in a pot and after 5-10 hammer curls .I got powder, that I can then put on top of my steel.
Cover w/a steel plate;( to keep the fleas down). I may not be doing anything for the steel ,but it keeps my left arm buff. :D