JohnB showed me a good one: sunflower oil. Wire brush the piece and gently heat to 'touch hot'. Apply a good but not excessive layer of oil with a rag, paper towel etx. You want enough to give a good coat but you don't want it dripping. Heat the piece again and watch out for a flare. The hotter the piece the darker the finish. Suppose you could probably use veggie oil, corn oil, peanut oil etc., but haven't tried it yet.
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