Sorry I was kinda late getting to this post John. Holy crap, it cold outside this morning. We have about 12 degrees. Decided to plug the tractor in and let it warm up for a couple hours before we move snow. Had about 6" yesterday. Snow sucks but we need the moisture if we are going to have crops this season.
This is my JK Kephart, cocobolo handle, red liners, ss hardware, 3/16" O1, blade length a little over 4-1/2". Stout little burger. And razor sharp too!
Anyway, as far as patina, I get out a shallow dish, I put about 2/3 white vinegar, 1/3 Jim Beam. I use a cloth that is fairly thick and can hold a fair amount of liquid. I wipe this on the blade 2 or 3 times until I get the base color I'm looking for. I try to keep it an even color. Then I rinse the blade under hot water and let the blade get kind warmed up pretty good. I dry it real good. With another cloth that is fairly thick and absorbent, I use my highly top secret ingredient (liquid Perma Blue). Then I hold the knife with the blade on its side and do one side at a time, dabbing the Perma Blue on the blade, letting the droplets kind of spatter. Let it set for a few minutes, rinse it off in hot water and dry. Repeat the other side the same way.
I felt this patina turned out fairly well and looked great on an older historical pattern like this knife. I do also like natural patinas but at the rate I would put this on a knife, and at my age, I would probably be pushing up daisies before it looked nice. Hope this explains it well enough. The picture is not the best, it looks even better in person.
Mike