antihalation

antihalation

[an-tee-hey-ley-shuhn, -ha-, an-tahy-] Photography.
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.

Origin:
1900–05; anti- + halation

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World English Dictionary
antihalation (ˌæntɪhəˈleɪʃən)
 
n
photog
 a.  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
 b.  (as modifier): antihalation backing

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