ANTI-HALATION
BACKING
[Film Technology]
[Film Technology]
Anti-halation backing
is under the base of film (i.e. Film base). Film raw stock for motion
picture camera, the transparent support or base, is coated with a light
sensitized emulsion and generally, an
anti-halation backing. Black anti-halo backing,
chemically removable while developing. See anti-halation layer. See backing
removal. A light absorbing layer. Many
types of film also include an anti-halation or light absorbing layer
either below the emulsion or on the reverse side of the base. This prevents light
from reflecting and passing through emulsion a
second time. Light absorbing layer in raw stock
that prevents reflection of light back into the light sensitive emulsion. After passing through the three colour
sensitive layers, light passes through the film base,
but is absorbed by the anti-halation layer
(usually an emulsion of carbon particles coated on the reverse side of the
film. Which acts to prevents any strong light from reflecting internally and
re-exposing the film. Many colour stocks
incorporate an antihalation layer of carbon
coated on to the back of the film.
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