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 ?
But District Judge Mike Snow yesterday dismissed the charge Mr Darken faced of using threatening, abusive or insulting words or behaviour.
Mr Darken lost the confidence of many officers after falling out with prisons minister Beverley Hughes and prison service boss Martin Narey.
As researchers watched, a fish darkened its body patches and eye rings in 22 of the 40 confrontations.
This production-ready film technology is based on embedded particles, which arrange themselves randomly when unpowered and darken the window from outside, while retaining transparency from the inside to the outside.
Put two strokes of mousse down the back and blend it in, so you darken down the back of your arm and it gives a slimmer silhouette to the arm.
For vehicle owners intending to darken their front and driver's seat windows beyond the approved VLT rates, they must first pay RM50 to apply for the ministry's approval, Loke said.
According to the Taichung City Government Tourism Bureau, the Darken Ecological Park is rich in colorful species of flying insects, with large swarms of butterflies by day and fireflies by night.
Scientists at the DOE's National Renewable Energy Laboratory (NREL) have developed a thermochromic window that not only darkens automatically in response to sun, but also generates electricity during the darkening process.
(3) For lighting, Elizabethan and Jacobean theatres used a combination of windows, lamps and candles, which would have given some ability to darken the auditorium by closing the shutters on the windows.
And I Darken is a gritty, alternate history that follows siblings Lada and Radu as they navigate enemy territory, fighting for survival.
Knights of the Lamppost There is a lamppost, shining bright, Giving off a brilliant light, Many a person, under to pass, Their essence, in its beam, to cast, Others under it, there to stand, Many a future romance planned Like a soldier straight, standing there, Many a secret tale could share, Its light to brighten many a darkened place, Shadows of time, nobody wanting to face, The moon also, shining down from high, When she is welcomed in the sky, But should a cloud darken her face, The streets, no longer a very safe place, The lampposts are knights, all in disguise, In their stance, all of one size, Such a chivalrous part to play, In all weathers they stand, their glory to be, Yet we, their presence may never see, So used to them, day and night, Their place in our world just so right.
Washington, Apr 15 ( ANI ): When male giraffes reach about 9.4 years of age, their once light spots darken to become coal-black, a new study has found.