Autochrome photograph by Arthur E Morton, who was honorary secretary of the Society of Colour Photographers and experimented with a number of photographic processes. Autochromes are transparent images on glass, similar to lantern slides. The autochrome process was patented in 1904 by French pioneering brothers Louis and Auguste Lumiere and was the first commercially available successful colour process for colour photography. It was available only in the form of slow plates, with grains of dyed starch acting as a colour filter for the light as it entered the camera. The resulting transparency produced a grainy effect reminiscent of French pointillist paintings.
© John Martin / Science & Society Picture Library