Antihalation backing
A dye used on the back of the majority films capable of absorbing light which passes straight through the emulsion.
They are as follows: overcoating, antihalation backing, and noncurl coating (fig. 2-2). The purpose of the five parts of photographic film are as follows: 1.
Below the base is an undercoat called the antihalation backing, which usually contains absorber dyes or a thin layer of silver or carbon (called rem-jet on color negative stocks).
contact film
a blue sensitive continuous tone film with a relatively high maximum density, excellent resolution, and a special antihalation backing that allows exposure through its base without loss of quality.
 See also: Backing, Emulsion, Film, Photography, Halation
  
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