You use a heated water bath or tray to keep your bottles of chemistry at the correct temperature.
And you want enough solution volume in the drum so the temp doesn't drop during development.
A prerinse with correct temp water prior to actual dev will help condition the inside of the drum. I
use RA4 chem at 84F. But ambient temp in the room itself shouldn't be so far out of whack that
you get a temp drop in the general process (and I live in the Bay area, so know what 50 deg is like
even midsummer!). Drum work way better than trays anyway, and are safer on your lungs. Make
sure you have decent ventilation!
I was wondering...? Does color paper come in fiber based and resin coated varieties or is it just one kind of paper?
It's resin paper only. Different surfaces of course such as glossy, lustre and matt but essentially one grade only so not multigrade as RC B&W paper is.
One thing will surprise you on RA4 printing. The paper is relative cheap. Color optical prints also have special quality that digital prints don't have. When I printed color, I never touched that cyan dial on the color head. What the hell they put it there for? :)
Turns out a few days ago I stumbled upon a post from PE in a thread from long, long ago that touches on this question: