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It also depends on the depth of the etching. This is a case by case basis and, again, you have to judge the depth of the etch against the depth of the pitting against the thickness of the blade. ...

That's your answer right there - you have to decide what you want it to look like and balance what you can take off with keeping the etch. AFAIK, there's isn't a way to "protect" the etching other...