I forced a patina on this Case CV Sowbelly this morning with cider vinegar and a paper towel. Although it looks a bit heavy, it will soon fade out to a nice even gray with use. I'll be carring this knife daily (along with at least one other knife) so it shouldn't take long for it to fade out.
Here is the same knife prior to my putting a patina on it. The difference in the color of the covers picture to picture is the lighting in which the knives were photographed. The true color of the covers is that of the one with the patina.