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...exposure under ultraviolet. The fluorescence produced by the
ultraviolet illumination provided additional exposure in the
affected areas that gave the necessary correction for
highlighting or colour correction, by eliminating the screen
pattern from “white” areas, in the case of monochrome, or
reducing printing dot sizes, in critical areas of colour work.
contribution of Ducos du Hauron French physicist and inventor
who in 1869 developed the so-called trichrome process of colour
photography, a key 19th-century contribution to photography. The
Autochrome process, introduced in France in 1907 by Auguste and
Louis Lumière, was the first practical colour photography
process. It used a colour screen (a glass plate covered with
grains of starch dyed to act as primary-colour filters and black
dust that blocked all unfiltered light) coated wit