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Multiple choice dyes dyes and pigments chemistry in daily life applied chemistry chemistry

In coloured photography, the colour film is developed by oxidation of the developer and then reacting with:

  1. an alkai to form a salt

  2. a coupler to form a dye

  3. an acid to form a salt

  4. a metal to form a pigment
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The development step uses reducing chemicals, and the exposed silver-halide grains develop to pure silver. The oxidized developer is produced in this reaction, and the oxidized developer reacts with chemicals called couplers in each of the image-forming layers. This reaction causes the coupler to form a color, and this color varies depending on how the silver-halide grains were spectrally sensitized. A different color-forming coupler is used in the red, green, and blue sensitive layers. The latent image in the different layers forms a different colored dye when the film is developed.