Anti-halation backing

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Camera film consists of three layers: the light-sensitive emulsion, the tough film base, and the anti-halation backing. The light that passes through the emulsion and the base is absorbed by the opaque anti-halation layer. This keeps that light from reflecting off of the aperture plate behind the film and re-exposing the emulsion, causing a ghost image. The anti-halation layer is removed during developing of the film.

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Category: Photography equipment

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• This page was last modified 10:33, 22 November 2006 by Wikipedia user The wub. Based on work by Wikipedia user(s) Gardar Rurak, Skysmith and Jpcarr.
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