Darkening

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Darkening

 

(or density), the deposition of metallic silver in a photosensitive emulsion in black-and-white photography, or the deposition of dyes in monopacks in color photography, that takes place during development. In photographic materials that do not require development, “direct” darkening occurs immediately after exposure. Darkening that appears upon development of unexposed photosensitive emulsions is called fogging. The quantitative measure of darkening is the optical density of the developed layer or the surface concentration of silver or other light-absorbing substance that produces darkening.

References in periodicals archive ?
Mr Darken lost the confidence of many officers after falling out with prisons minister Beverley Hughes and prison service boss Martin Narey.
But District Judge Mike Snow yesterday dismissed the charge Mr Darken faced of using threatening, abusive or insulting words or behaviour.
Electrochromic technology uses electricity to darken an electrically conductive medium between two layers of glass.
If the vehicle is parked, the windows darken automatically, so the inside of the vehicle cannot be seen from the outside.
The eclipse will begin gradually and the lower left edge of the moon will darken noticeably around 6:30 p.
At the same time, their starches convert to sugars that darken during cooking, creating brown spots on french fries and potato chips.
Open on CBS and NBC in June, are the newest work by award-winning Darcy/Fox director Brett Darken.
Hollywood's been struck dumb, silenced by a dubbers strike in Italy that could darken the silver screen.
This could result in a fresh ice surface, one that has not had as long to darken in the sun.
Climate change has increased the growth of algae, which darkens the surface of the ice sheet and leads to more rapid melting as it reflects only 35 percent of solar radiation compared to the 90 percent reflected by white snow.
Keratin is also found in human fingernails, and melanin is the substance that darkens human skin.