Understanding Neutron Radiography Reading V-Kodak Part 2 of 3

Agitation of the film during development brings fresh developer to the surface
of the film and prevents uneven development. In small installations, where
few films are processed, agitation is most easily done by hand.
Immediately after the hangers are lowered smoothly and carefully into the
developer, the upper bars of the hangers should be tapped sharply two or
three times on the upper edge of the tank to dislodge any bubbles clinging to
the emulsion.
Thereafter, films should be agitated periodically throughout the development.
Acceptable agitation results if the films are shaken vertically and horizontally
and moved from side to side in the tank for a few seconds every minute
during the course of the development. More satisfactory renewal of developer
at the surface of the film is obtained by lifting the film clear of the developer,
allowing it to drain from one corner for 2 or 3 seconds, reinserting it into the
developer, and then repeating the procedure, with drainage from the other
lower corner.
Charlie Chong/ Fion Zhang
Radiography in Modern Industry. Rochester, NY: Eastman Kodak Co. 1980