I just use a Zippo most of the time. Gets kinda hot after a long session but at least the room doesn't fill up with soot.
The other thing that works pretty well is inletting black,,but you have to put it on VERY sparingly. You don't want any build up of the marker on the surfaces.
For that a toothbrush works well and start out with just a dot of the black onto the bristles. I charge and if needed recharge the brush by swiping it into the inside of the cap on the little bottle.
There's more than enough there to do the job. Scrub it onto the metal surfaces you want to blacken and it'll just barely darken them,,that's good enough to get a read.
No candles, no soot lamps, no Zippos
