How do I get that aged, blackish finish I have seen on a few examples here on this forum? I like the brown but I would like the blackish, NOT FULLY BLACK finish on my steel parts. I'm sure there are some secrets some builders might not want to give up but I'm hoping someone will help me out here.
I heard to brown then plunge into boiling hot water, I tried that and it didn't work. Is there a chemical to use?
Thanks,
Ole Scout