Gold coin patina restoration

I purchased an Old gold coin (1854 $10 Liberty) that had been mildy cleaned with a silver polish. Gold coins of the this era are 90% Gold, about ~8% copper and ~2% silver. The cleaning "made the coin shinny". The problems is that in the light rubbing process removed the top layer of patina. I would like to restore the patina. The patina I don't believe was ever very heavy or deep. Aside of letting the coin sit out in the open air for the next 150 years what are my options? I would like to restore it over a period of time prehaps a year or 2 or more. I am not in a hurry I just would like to restore the coin to what 150 years of age would do to it.

Any suggestions?

Brian,

At this point, leaving your coin out in the open air for 150 years would leave you with what you have now, a shiny coin. I would recommend taking it to a professional who specializes in coin restoration and have him perform a process called "whizzing" This is a microscopic "scouring" of the coin's surface that gives it a mint state appearance and will eliminate the high polish.

Hope this helps and good luck,