A group of friends from the Manchester area on holiday relaxing at Ladore c1930s. The image is interesting because it was photographed using the Dufaycolor process. It was processed by amateur photographer William Johnson of Whitefield and transferred on to a glass plate for projection.
Wikipedia describe Dufaycolor in the following terms:
‘Dufaycolor is an early French and British additive color photographic film process for motion pictures and stills photography. It was based on a four-color screen photographic process invented in 1908 by Frenchman Louis Dufay. Dufaycolor worked on the same principles as the Autochrome process, but achieved its result using a slightly different method. .. The film base was dyed blue, printed with a mosaic using a resistive greasy ink and bleached. The resulting spaces were then dyed green. The process was repeated at an angle, the new spaces being bleached and dyed red, forming a mosaic of color filters consisting of a mesh of red, green and blue lines, at approximately one million color elements per square inch, known as a reseau.[1] When exposed to light through the reseau, the film's emulsion was exposed to a single color of light. Thus the emulsion behind each color element recorded the tones for each primary color. Upon projection, the reseau served to filter the white projected light, so that the colors of the photograph corresponded to those in the recorded scene; for example, red values were only shown in red. The same principle applied to green and blue components In 1926, the Dufaycolor process was purchased by British paper manufacturing firm Spicers. The firm then funded research to turn Dufaycolor into a workable color motion picture film process. In 1932, Spicers finally released Dufaycolor as a motion picture process.’
Source acknowledgement: http://en.wikipedia.org/wiki/Dufaycolor
[1] The glass colour transparency proved extremely difficult to scan to produce the Ladore image on this websites because of the reseau making it very difficult to sharpen without the occurrence of moiré patterns. KH)