anti-halation layer

Definition: (1) Light-absorbing coating applied between a photographic emulsion and back support in order to prevent reflection of stray light from the film support material back into the light-sensitive area. * Also known as anti-halation coating. (2) Light-absorbing material -- e.g. black velvet -- laid under a brightly light subject to prevent the formation of a secondary image when examined or photographed.

Related Terms: halation

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