Reducers
Are solution which removes silver from negatives and prints. They are used to diminish density and alter contrast on a photographic emulsion.
Common reducers are hydroquinone, metol, and phenidone. AcceleratorThe accelerator is added to the reducing agent to speed development. It also increases contrast.
-Chemical reducer - see Reducers.
-Chemical vapor - method of exposing negatives in a closed container to a small amount of mercury of sulfur dioxide. After approximately 24 hours the film is developed normally.
Iodine
The chemical used in reducers and bleachers.
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More Photographic Terms ...
One of the shortest is the Meade LXD-75 at f/4, most are even slower at f/11 or more and require focal reducers for reasonable exposure times.
In a portrait retouching could be used to improve a sitter's appearance, for instance, by removing facial blemishes, and in a landscape with an overexposed sky, clouds could be painted into the image. Water-colours, inks, dyes and chemical reducers ...
 See also: Reducer, Camera, Film, Image, Time
  
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