BLACK AND WHITE
REVERSAL FILM DEVELOPING
[Film Technology]
The film
first passes through a normal black and white developer. This results in a developed silver image
in the exposed areas of the film, while unexposed areas remain as silver bromide.
After a stop bath the film passes into a bleach solution, which contains oxidizing agent to reconvert the silver into the
ionized form and dissolve it. A cleaning
bath removes residual deposit of oxidized bleach,
after which the film is left with a residue
of silver halide in inverse proportion to
the original negative image. After exposing on fogging
the film with white light, the film passes into a second
developer which converts all the silver halide
into metallic silver. After fixing
and wash, there remains a silver image in the
originally-unexposed areas, so that darken areas of the film correspond to shadows, with increasing exposure
resulting in lighter areas of the image; a
direct copy of the original.
e-mail : pratheepvasudev@gmail.com
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