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 ?
The study also raises questions about whether Greenland's high plateau is darkening as previous reports have suggested.
Batiste's capacious sense of the United States' imperial imagination is a strength of Darkening Mirrors.
Titan's limb darkening is especially prominent during transits, when the satellite crosses the face of Saturn.
While the darkening of the zinc yellow mixtures and the aging of the painting as a whole are undeniable, the exact extent of the changes remain under investigation.
On the other hand, several authors [15, 23, 27, 29] have reported a considerable darkening of cellulose-thermoplastic composites during compounding.
It had been known for nearly two centuries that light broke down the white compound silver nitrate, darkening it (by liberating tiny specks of metallic silver).
TEHRAN (FNA)- The findings of a new research suggested that carbon from passing comets could be the planet's mystery darkening agent.
They found that the Dutch master's decision to use yellow paint mixed with white is responsible for the unintended darkening.
One of the most obvious reasons is the lighter mornings triggering early wakening Before you start taking remedies for this try darkening your bedroom.
When young Atlantic salmon squabble over a patch of river, the one that's getting the worst of the tussle says "uncle" by darkening its skin and eye ring.
While it's too early to tell from a one-month slowdown in sales activity, what we could be seeing here is the darkening weather front coming from the Asian crisis,'' he said.