Colour coupler
A colorless substance contained in colour film emulsions that, when exposed to chemical developing baths forms the colour dyes that make up part of the layers of processed colour films.
The emulsion layers can include the colour dyes, as in Ilfochrome); or they can include colour couplers, which react with colour developers to produce colour dyes, as in type C prints or chromogenic negative-positive prints.
Non substantive
Is a name given to colour film in which the colour couplers are not contained within the emulsion, but are introduced during processing.
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 See also: Coupler, Film, Emulsion, Processing, Speed
  
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