The density D of silver deposit on a photographic plate or film is defined by the relation
where O is the opacity. If I 0 and I are the incident and transmitted intensities respectively the opacity is given by I 0/I. The transparency is the reciprocal of the opacity or I/I 0.
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References
Printing ink handbook. National Association of Printing Ink Manufacturers Inc., Kluwer Academic Press, London, UK, 1976.
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(2007). Photographic density. In: Gooch, J.W. (eds) Encyclopedic Dictionary of Polymers. Springer, New York, NY. https://doi.org/10.1007/978-0-387-30160-0_8533
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