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Have a RC Mauser that I'm fixing up and I'm wondering what I should use to remove the blueing from the buttplate? (which was left "in the white" on originals correct?)
Soak it in White Vinegar, the same as you use for cooking (Acetic Acid) and then give it a real good rinse with water.
Keep an eye on it when you do it.
Bluing is coloured metal. you can not remove blue without removing metal. Acid, fine beadblasting and emery paper will all do the job. If I were you I would use the latter.