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-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.
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: Reducers, Photography, Photographer, Color, Printing
  
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