Understanding Neutron Radiography Reading V-Kodak Part 2 of 3

Under no circumstances should ice be placed directly in processing solutions
to reduce their temperature because, on melting, the water will dilute them
and possibly cause contamination. Because of the direct relation between
temperature and time, both are of equal importance in a standardized
processing procedure. So, after the temperature of the developer solution has
been determined, films should be left in the solution for the exact time that is
required. Guesswork should not be tolerated. Instead, when the films are
placed in the solution, a timer should be set so that an alarm will sound at the
end of the time.
Charlie Chong/ Fion Zhang
Radiography in Modern Industry. Rochester, NY: Eastman Kodak Co. 1980