Chapter   | 13 |

Image formation and the photographic process

Geoffrey Attridge

All images © Geoffrey Attridge unless indicated.


The foundation of silver-based photography is the light sensitivity of silver salts named silver halides: the chloride, bromide and iodide salts. The latter is usually a very small percentage additive to silver bromide crystals. The discovery by Richard Leach Maddox in 1871 of a method of coating a gelatin dispersion of silver halide crystals on glass plates heralded the universal use of gelatin as a colloid in photographic emulsions.

Silver salts are usefully light sensitive, or can be made so by spectral sensitization. They are also developable to amplify the invisible effect of small exposures – the ...

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