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Just do a search there is a lot of info out there on this. The more I think about and if it were me, I would do all the grinding or whatever is needed then shine the blade up removing all the traces...

I have etched one blade with warm Apple Cider Vineager. It worked great. I didn't ask why Apple Cider instead of regular vineager but thats what I was told, so I used it. They are the same acid...