i did one with potassium nitrate, and i really liked the color ...but hated the crystallization that occured...aka "the clean up"
as it cooled there was crystal formation in all the crevices , holes...everywhere.
cold bluing is too blotchy looking.
so what do i use to get a nice dark blue color (chemically) without the intensive clean up?
i'm not looking to use a rust cabinet either.
thanks, mike