A heliochrome, derived from the roots "helios" = sun and "chroma" = color, (literally sun colors), is a color photograph, particularly one developed using the incomplete color processes from the late 1800s and early 1900s.

In the 1860s, John Herschel discovered that a sheet of blackened silver chloride paper, exposed to the sun under red glass would turn red in color. Under blue glass, it turned blue. Other colors resulted in a muddy purple tone.

Source: adapted by the editor from Wikipedia, the free encyclopedia; from the article "Heliochrome". Image Credit.

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