antihalation

[ an-tee-hey-ley-shuh n, -ha-, an-tahy- ]
/ ˌæn ti heɪˈleɪ ʃən, -hæ-, ˌæn taɪ- /
Photography

noun

the process of treating a film base with a light-absorbing substance to prevent refraction of light from the rear of the film.

adjective

resistant to halation.

Origin of antihalation

First recorded in 1900–05; anti- + halation

British Dictionary definitions for antihalation

antihalation
/ (ˌæntɪhəˈleɪʃən) /

noun

photog
  1. a process by which light, passing through the emulsion on a film or plate, is not reflected back into it but is absorbed by a layer of dye or pigment, usually on the back of the film, thus preventing halation
  2. (as modifier)antihalation backing