For anyone interested, I thought that I would post a couple pics of a Cast bullet that has had the "black" patina procedure performed to it according to Tony Grieco's tutorial at: http://www.cast-lighting.com/art-tony-color.html For anyone like myself that does not like the typical "green" patina nature of copper materials (first a chalky white residue and then the slow turn to a chalky green color), this procedure did give me an instant "black" patina that I am much more happy with. The results were almost instantaneous on the bronze however it at first has more of a very dark green color to it (the color of the ammonia/sulfur liquid) but when it dries it is much more rustic black with hints of bronze. For kicks, I shot a spray of the solution on the "logo" side of the fixture record tag (which is copper) and that stuff went instantly to jet black. No speckles, gradation's or anything, just jet black. Some wiping with a rag while it is still wet will remove enough of the black to match the bronze coloring, but I will be removing all of the tags before spraying because it might be hard to read them when the entire tag is black. Anyhow, I saw the picture that Cast had on the web and so I thought that I would confirm that this procedure indeed provides the described results. The first pic shows a before and after comparison. Of course, the solution does smell like rotten eggs, but you probably want to do this outside anyhow. A good tip from Tony was to do color testing on the bronze stake first, then if you (or client) doesn't like the color in person, the stake gets buried in the ground anyhow so it doesn't matter.