Been searching all over the web now and I am just trying to find out what this process is called. I see it in a lot of old movies. Guy puts a lighter to his iron sights to hide the shine of the metal for a night raid etc. Is this something grunts used to do cause it was easy and fast, and no one does it any more? I tried it on a knife blade and it looks kind of cool if I can make it consistent. Obviously it wipes right off, but is it safe to leave there? Will it prevent rust? Will it exacerbate it? Haven't ever used this on a firearm, but I am curious if you all have, and if so, what you refer to this as when you do it...
Cheers