The density D of silver deposit on a photographic plate or film is defined by the relation
where O is the opacity. If I o and I are the incident and transmitted intensities respectively the opacity is given by I o /I. The transparency is the reciprocal of the opacity or I/I o . (Printing ink handbook. National Association of Printing Ink Manufacturers, 1976)
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Gooch, J.W. (2011). Photographic Density. In: Gooch, J.W. (eds) Encyclopedic Dictionary of Polymers. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6247-8_8674
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