Adams got a few things about toning wrong. He also advocated mixing the toner with hypo-clearing agent and then tossing it way before capacity was reached, both bad practice now.
Originally Posted by silveror0
From the Kodak Technical Publication on Toning Black-and-White Papers:
"1. Dilute the toner with water according to the tone change
2. Immerse a thoroughly washed print in the toner solution
at 20°C (68°F) and agitate the print. Complete toning
occurs in 2 to 8 minutes, depending on the paper type
3. When the print has almost the required tone, remove it
from the toning bath; toning will continue to some
extent in the wash."
I tone all the time with fix, toner and wash-aid all at the same temperature (I usually work at ambient temperature when printing) and the toner works just fine. Heating it up, and keeping it warm during an hours-long session is just too much of a PITA.