Question about the durability of artificially induced patina on brass

I have tried a number of commercially available 'antiquing fluid' products for the patination of brass, and have been more or less satisfied with the results for most of my applications. However, all of these finishes that I am aware of are fragile and will not withstand handling unless coated or sealed in some way. I do not want to seal the finish as I would like the metal to continue to age as it wishes. Can the deep, durable rich brown patina brass naturally acquires with age/exposure be artificially induced? I am particularly interested in why the natural oxidation is so much more durable than what say, selenium dioxide produces, and what is the difference? My particular dilemma at the moment involves an antique made of brass that had to be polished to be properly repaired. It is an object that is frequently handled, and I am looking for an artificially induced patina that will withstand this in the same way the original natural patina did, or at least give it ahead start toward turning again. Any assistance would be greatly appreciated.