Did a one day rust blue on the barrel today. I started it last night, polished with 400 grit silicone carbide, immediately went out and degreased, swabbed on rust blue, and left overnight. Barely rusted at all.
(You need to Login or Register to view media files and links) (You need to Login or Register to view media files and links) But, I thought I'd just go ahead and steam anyway, and it did get some color. But, it was pretty mottled and light.
(You need to Login or Register to view media files and links) My steamer is pretty simple, I took a shower flange, used a hole saw to cut the top off of a pressure cooker, screwed the flange on it with a large foam rubber seal I got from some plumbing fixture, and a piece of ABS pipe onto the flange for a steam chamber. Put a couple of quarts of water in it, get it boiling steady, hang the barrel in it for 15 minutes, capped with a can lid to hold in most of the steam. Converts the red rust to black oxide nicely.
(You need to Login or Register to view media files and links) (You need to Login or Register to view media files and links) Degreased again, swabbed again, and then thought I'll just use the steamer as a humidity chamber to rust quicker, and hung the barrel in it. That worked a bit better, would get some grey staining in about an hour, but not very even. I went ahead and steamed anyway, and came out black, but pretty spotty/mottled. I just persisted, for 6 cycles. The color evened out, nice dark black, I'm satisfied with it. 24 hours, start to finish, rust blued barrel. I'll look at it in daylight tomorrow and see if I want to do any more cycles, or just oil it and install.
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