I did something stupid and dipped the end of my Hawken Barrel in Evapo-Rust.

I was trying to get the rust off from around the nipple in a restoration project on a neglected barrel. Well, I got the rust but also took the blueing off the bottom inch of the barrel. I've seached the forum but can't find mutch info.

Anyone have a suggestion for cold blueing to best match the rest of the barrel? The remainder of the barrel looks like new.