 Joly colour screen

The Joly colour process is an early additive colour photography process devised by Dublin physicist John Joly in 1894.Based on a method proposed in 1869 by Louis Ducos du Hauron in "Les Couleurs en Photographie – Solution du Probleme", the Joly colour process used a glass photographic plate with fine vertical red, green and blue lines less than 0.1 mm wide printed on them.