If the frame is original wear with just patina, I would leave it be. If you look at my album of my 12g. Trojan, that gun has new wood. The barrels are nice for being original. And the frame is just original case hardened which is now worn to an even gray/silver patina on the outside and I think it suits the gun just fine.
It is when frames have rust, damage or pits and such that I think that re-coloring might be called for. Especially when next to new wood or bluing.
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B. Dudley
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