David: I really don't think that it's possible to etch while retaining the original patina. In order to bring out the best pattern that would be viewable it's been my experience that you need to bring the blade up to some semblance of polish. You might try simply degreasing the blade, and then etching without polishing, or maybe using oooo steel wool on the blade before etching, in which case most of the original patina might be retained. It's just a matter of individual taste as to how they like a pattern to look. In my case, i like as high contrast as possible. I like a nice patina on wood, but in my opinion, patina on metal equals NEGLECT. In almost all of the cultures that we collectors deal with, the people are immensely proud of their weapons. Some reference books have stated that the silver would have been kept polished, the gold would have been kept clean and blades would have been kept in a condition of "stain", or at least been cleaned periodically. I firmly belive that most of what we see as collectors, has been stored in a auction wherehouse, or in someones attic for 50 or 80 or even 100 years. Pieces just wouldn't look that "gungy" if they were being used. Maybe this is just my opinion and no one elses...........Dave
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