REVERSAL PROCESSING Normal processing of black-and-white film produces a negative; from this negative, a positive is made. However, by using the reversal process, you can produce a positive image directly on the black-and-white film.
Reversal Processing
The process in which film is exposed so that it will become a positive instead of a negative or a negative instead of a positive.
Reversal Film ...
Reversal Processing
In reversal processing, the first development is selective; that is, only silver halide grains that have been rendered developable by the initial exposure are reduced.
In color reversal processing the film is developed in an MQ (metol/hydroquinone) developer similar to a black-and-white developer, followed by a rinse or a stop bath. The film is fogged in the reversal step, and is then developed in a color developer.
Also, for reversal processing, think of the ortochromatic films, provided from Mahn, e.g.
When reproduced with reversal processing on negative-type photographic paper, the image appears in the same tones as the actual scene. Neutral Density Filter A neutral density or ND filter.
-Sodium hydrosulfite - used as a fogging agent in reversal processing.
-Sodium hydroxide - highly active alkaline accelerator used in conjunction with hydroquinone to produce high contrast developers.
Sodium hydrosulfite
Is used as a fogging agent in reversal processing.
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 See also: Processing, Light, Reversal, Photograph, Film
  
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