ˈheliochromyn. the production of images of objects in the natural colours by a photographic process.
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heliochromy1855
photochromy1878
colour separation1904
separation1924
1855 tr. Niépce de St. Victor's Researches 43Heliochromy.
1892 Daily News 5 May 6/5 Mr. Fred. E. Ives, of Philadelphia, gave an exhibition..of his ‘composite heliochromy’, the name of his process of coloured photography.