One more thing, I haven't made Kallitypes in a great long while, but I and the experience that I would get good prints, in those days using arches watercolor or cranes, and then I'd get lots of prints with mottling. Somewhere I read that at that point the developer, in my case Rochelle Salts should be tossed. Indeed, using fresh developer gave me better richer, smoother prints. Richard Sullivan's Athenatype process is said to solve a lot of the problems that are inherent in the Kallitype process. Here's a demo:
http://www.youtube.com/watch?v=Reh35N8ziqA