https://www.nfsa.gov.au/sites/default/files/2025-02/Colour%20TV%20Mega%20Menu%203%20TVs_1000x745%20px.jpg
Infra-red
Electromagnetic radiation from 730 nanometres to 1mm, longer in wavelength than light. It is emitted by hot bodies. Invisible radiation above 700nm; used in projector sound optics (1985).
References
Case, D., 1985, Motion Picture Film Processing, Media Manuals, Focal Press, London, Boston
The National Film and Sound Archive of Australia acknowledges Australia’s Aboriginal and Torres Strait Islander peoples as the Traditional Custodians of the land on which we work and live and gives respect to their Elders both past and present.