So I finally got around to ordering some new patina a couple weeks ago, and I thought why not explain the whole patina process. So here it goes..
After I get a piece to a final state I set up my work area, slap on some gloves and clean up my pieces to get any oil or dirt off them. I use soap and a soft scrubby, you could also use acetone. I have a green patina, which works on brass and copper, and a liver of sulfur patina to give a grayish black finish on brass, copper, and will also darken silver. This is what the patina looks like. The green patina comes in a blue liquid and the liver of sulfur in rocklike pieces.
I dilute the green patina and usually brush it on the piece. With liver of sulfur I take a very small bit of it and dissolve it in warm water and then apply with a brush. It take a couple coats with both. Sometimes you may want to dip the whole piece in the solution and you can also heat the work with a blow dryer to vary color.
After the patinas dry they can be a little chalky so I usually rinse them off and dry them again. Using fine steel wool you can perfect the finish and lightly rub away areas.