Understanding Neutron Radiography Reading V-Kodak Part 2 of 3

Different types of x-ray films require different quantities of processing
chemicals. It is, therefore, important that the solutions be replenished at the
rate proper for the type or types of film being processed and the average
density of the radiographs. Replenishment rates must be measured
accurately and checked periodically.
Over replenishment of the developer is likely to result in lower contrast; slight
under replenishment results in gain of speed and contrast, but severe
underreplenishment results in a loss of both. Severe under replenishment of
developer can cause not only loss of density and contrast but also failure of
the film to transport at any point in the transport system.
Over replenishment of the fixer does not affect good operation, but is wasteful.
However, under replenishment results in poor fixation, insufficient hardening,
inadequate washing, and possible failure of the film to be transported in the
fixer rack or at any point beyond.
Charlie Chong/ Fion Zhang
Radiography in Modern Industry. Rochester, NY: Eastman Kodak Co. 1980