I have a 1911 rear sight that I need to age to a patina to match my 1913 Colt. What is the best way to do it?

My colt has little to no finish left, and has turned to a black/brown patina. I finally found an original Colt round rear sight to replace the incorrect one, but it is almost worn white. It doesn't match at all with the finish of my pistol.

And since round rear sights are almost impossible to find, I am gioing to try to make this one match if I can. So I am wondering if I can age it to match the patina.

Any help would be appreciated.

Steve
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