Thanks for the quick physics lesson, polyglot. Boy that took me back a few years. Like 33. After reading through it all, it almost makes me feel as if it were a miracle that, when I'd done E6 developing before just using a bathroom sink and ice cubes, things came out at all. But came out they did -- actually quite well, in fact. Yeah, I failed to mention that I was just planning to use a cheapo styrofoam cooler for the bath. They're cheap but they make for great insulators. Hey, if I don't have to use a heater, I won't. Just one fewer thing to worry about.