What I really like to do is run at about 10-15%, depending on how much oxidation you’ve got and about 140. I don’t like to go much higher than 140, even 120 is OK. It depends on what alloy you’re looking at. Copper tends to be OK; brass will actually darken up with heat. You want to keep that temperature down. Cycle times are generally about 10 minutes. Again, that’s really dependent on the level of oxidation you’ve got but for the most part within 10 minutes we can remove anything that the citric acid is going to remove.