What does photogene mean?
A photogene is a chemical substance used in photography to sensitize an emulsion, enabling it to respond to light. In the development of photographic processes, suitable sensitizing compounds were essential for determining how a plate or film responded to particular wavelengths and how long it needed to be exposed. The word is now uncommon and survives mainly in historical and specialist photographic literature. Its structure reflects its original sense of a light-producing or light-related substance: the prefix photo- refers to light, while the ending -gene conveys production or generation. Although photogene can sound like photogenic, the two words have different functions. A photogene was a material used to prepare photographic emulsion, while a photogenic person, place, or object is one that produces an appealing photographic image.
nounA chemical substance used to make a photographic emulsion sensitive to light. The term is now chiefly historical or technical.
- A chemical substance used to make a photographic emulsion sensitive to light.
"The photographer mixed a trace of the photogene into the emulsion before coating the plate."
"The newly prepared photogene was added to the emulsion under subdued light."
"Early photographic manuals described different photogenes for plates intended to capture different portions of the spectrum."
The plural is used mainly in historical or specialist photographic writing.
"Several photogenes were developed for use with different photographic plates."
Before modern film, photographers relied on chemical sensitizers called photogenes to make light-sensitive plates.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does photogene come from?
The word entered English from French photogène during the 19th century. French photogène combines the Greek-derived element photo-, meaning “light,” with -gène, meaning “producing” or “generating.” Its photographic sense developed from an earlier association with the production or transmission of light and subsequently referred to substances that made photographic preparations sensitive to light.
How photogene is actually used
Photogene is a rare, chiefly historical technical term. It should not be confused with photogenic, which describes a person or thing that appears well in photographs.
Easily confused with photogene
A photogene was a substance that sensitized photographic emulsions, whereas a photogenic subject or material is one that photographs attractively.