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I have not used the vinegar, I have used bluing and bleach to get a patina effect on a blade though. Charlie has quite a few videos and they are worth watching, if for no other reason than to watch...

If you are interested in darkening the etch here is a Spazola video on vinegar use
Etching A Blade With Hot Vinegar - YouTube

well that has worked out fairly well. Bone scales would be nice. I just started plating with bone as a scale material. I have to say it heats up fairly quickly on the sander and if you get a burn...