A Dufaycolor colour transparency of a detached house, taken by an unknown photographer in about 1940. The Dufaycolor proces was introduced as cine film in 1932 and as rollfilm for still photography in 1935. Based on Frenchman Louis Dufay's (1874-1936) Dioptichrome proces of 1908, it was the last 'additive' colour proces to be marketed and consisted of a very fine, regular filter screen made up of red, green and blue lines printed on a film base. Dufaycolor was popular with both amateur and profesional photographers and survived until the 1950s.
© Kodak Collection / National Science & Media Museum / Science & Society Picture Library