Photo developing London
A c-type print, usually made from a colour negative, is a colour print in which the print material has at least three emulsion layers of light sensitive silver salts. Each layer is sensitised to a different primary colour - either red, blue or green - and so records different information about the colour make-up of the image. During printing, chemicals are added which form dyes of the appropriate colour in the emulsion layers. It is the most common type of colour photograph.
Possibly the Gresley Family at Giffords Hall, Stoke-by-Nayland, Suffolk, photograph by Calvert Richard Jones, 1845-48, calotype. Museum no. PH.94-1983, © Victoria and Albert Museum, London