I've just bought a second hand Paterson Orbital print processor with the intention of developing BW 8x10 prints in it. The manual makes reference to the "pre-soak calculator", which I do not have. As I understand it, assuming you want to raise your temperature to 20C, and the room is say 18C, you let your chemicals be at room temperature, and pre-soak the tray/print for 30 seconds in water at a temperature greater than 20C, determined by the calculator. This is appealing to me! Does anyone have a pre-soak calculator from which they'd be able to give me a few examples of how to get to 20C, so that I have an idea what temperature to set the pre-soak at? Many thanks, Simon.