Don't take this as an endorsement of "pre-aging" your cymbals, however:If I were to do that (on the link), I would use a spray bottle for a vinegar/saltwater mixture.Another way to accelerate oxidation is to polish the cymbal. Yes, I said it- once you polish a new cymbal, the metal now wants to get back to being dull and patina'd. Let me put it like this: I polished a few months old K and it wanted to revert to being tarnished MUCH quicker. I even used the Zildjian cymbal cleaner and it did that!!!
Well I looked into it a little more. For brass something like that will work. For b20 on the other hand it is a different combination. You can still do it but you need to deal with stuff that will deal with tin and copper. I want to g get a old cymbal now and try it out. Not mine though for sure, and experiment and try combination cause there is a way to create a patina really fast and not destroy the cymbal.