antihalation

noun

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

adjective

2. resistant to halation.

noun

1. 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