Vivex was an early color photography process invented by the professional photographer Dr. D. A. Spencer.[1] It was produced by the British company Colour Photography Ltd of Willesden from 1928 until 1939 when the company closed down. Up until World War II, the Vivex process accounted for 90% of UK colour print photography.[2] It was a wash-off relief process using three negatives on waxed cellophane, one for each primary colour (i.e. a "subtractive tri-pack process"). The company operated the first professional colour printing service.[2]
A noted proponent of the Vivex process was Yevonde Middleton whose work helped overcome public scepticism about the merits of colour photography.
A Short History of Colour Photography (National Media Museum)