A heliochrome is a

color photograph Color (American English) or colour (British English) is the visual perceptual property deriving from the spectrum of light interacting with the photoreceptor cells of the eyes. Color categories and physical specifications of color are associa ...

, particularly one made by the early experimental processes of the middle 19th to early 20th centuries. The word was coined from the Greek roots "helios", the sun, and "chroma", color, to mean "colored by the sun". It was applied to images as technologically diverse as

Levi Hill Levi Hill (26 February 1816 − 9 February 1865) was an American minister in upstate New York who claimed in 1851 that he had invented a color photographic process. Borrowing terms previously introduced in France, Hill called his process " ...

's "Hillotypes" of the 1850s (Hill's instruction book was entitled ''A Treatise on Heliochromy''), the three-color carbon prints made by

Louis Ducos du Hauron Louis may refer to: * Louis (coin) * Louis (given name), origin and several individuals with this name * Louis (surname) * Louis (singer), Serbian singer * HMS ''Louis'', two ships of the Royal Navy See also Derived or associated terms * Lewi ...

in the 1870s, and the interference color photographs made by

Gabriel Lippmann Jonas Ferdinand Gabriel Lippmann (16 August 1845 – 13 July 1921) was a Franco-Luxembourgish physicist and inventor, and Nobel laureate in physics for his method of reproducing colours photographically based on the phenomenon of interference. ...

in the 1890s. It was also occasionally misapplied to images whose color was non-photographic, i.e., due to local coloring by handwork of some kind.

References

History of photography Photographic films {{photo-stub