A Dufaycolor colour transparency of the entrance to the Kodak factory in Harrow, Middlesex, taken by an unknown photographer in about 1936.

Kodak opened a factory in Harrow near London in 1891. It made cameras as well as photo paper, photochemicals and other accessories. The factory closed in 2016.

The Dufaycolor process was introduced as cine film in 1932 and as rollfilm for still photography in 1935. Based on Frenchman, Louis Dufay's (1874-1936) Dioptichrome process of 1908, It was the last 'additive' colour process 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 professional photographers and survived until the 1950s.