Photochromy
Photochromy is the art or process of reproducing colors by Color photography, photography.[Note] Photochromy is not to be confused with photochromism (photochromics), a reversible color change induced by light energy (previously termed "phototropy").The Focal Encyclopedia of Photography, page 1079, Desk Edition (1969), Focal Press, Furthermore, a so-called photochrom–a black-and-white photograph colored by hand using an 1880s method–is not the result of the photochromy process (although the more specific and later 1890s method of Lippmann plate, Lippmann color photography to create what was sometimes termed a "''direct'' photochrome" or "Lippmann photochrome" is such a result). History * Colored images by ''direct exposure from nature'' using a Lippmann plate * Color printing method by the bleach-out process. ''See Utocolor and Ilfochrome, Cibachrome'' See also * Color photography Notes In the original publication in 1891, Lippmann reports on photochromy in which he descr ...
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