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Orthochromatic
An emulsion that is sensitive to blue and green light only. Used in duplicating motion picture films. Does not record red light and can be handled safely under red light conditions.
https://www.nfsa.gov.au/sites/default/files/uploads/2010/08/31/ortho.gif
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.