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Old February 27, 2020, 09:17 PM   #9
dakota.potts
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Join Date: February 25, 2013
Location: Keystone Heights, Florida
Posts: 3,014
You can use a very dilute solution of vinegar, blue and rust remover (phosphoric acid), or naval jelly to dull the finish, but too strong a solution or too much time will strip the bluing altogether.

Reading some forum posts from engravers who do a "french gray" technique, I see a lot of talk about using a pink pencil eraser to polish gray finishes.

Just some thoughts.
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