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 classic literature ?
The impression of its actual state, at this distance of a hundred and sixty years, darkens inevitably through the picture which we would fain give of its appearance on the morning when the Puritan magnate bade all the town to be his guests.
Still you are miserable; for hope has quitted you on the very confines of life: your sun at noon darkens in an eclipse, which you feel will not leave it till the time of setting.
High over the tree-tops, in a widespread, trailing, noisy crew, there fly, with resounding cries, flocks of birds which seem to darken and overlay the very heavens.
What grievous affliction hath befallen you," she earnestly inquired, "that you should thus darken your eyes forever?
Awful and threatening scowls darken the face of the West Wind in his clouded, south-west mood; and from the King's throne-hall in the western board stronger gusts reach you, like the fierce shouts of raving fury to which only the gloomy grandeur of the scene imparts a saving dignity.
He drew near to the window, resumed his place in the balcony, and remained there, motionless, annihilated, dead, till the moment when, the heavens beginning to darken, the first flambeaux traversed the enlivened street, and gave the signal for illumination to all the windows of the city.
Rarely, however, did any cold-water caitiff of the kind darken the doors of old Baranoff; the coasting captains knew too well his humor and their own interests; they joined in his revels, they drank, and sang, and whooped, and hiccuped, until they all got "half seas over," and then affairs went on swimmingly.
Kim assisted at two or three with grave advice, meant to darken counsel and to show off his wisdom before the lama and the admiring Kamboh.
For by that time, though their virtue be the same, yet it hath not the same lustre; for fresh men grow up that darken it.
My dear, dear son, now that approaching disgrace begins to darken the closing years of my life, I can write with all truth and honesty that it is not the terror of the law, it is not the loss of my position in the county, nor is it my fall in the eyes of all who have known me, which cuts me to the heart; but it is the thought that you should come to blush for me--you who love me and who have seldom, I hope, had reason to do other than respect me.
Straightway a great flock of wild crows came flying toward her, enough to darken the sky.
Then let my lords darken the moon, and save the maiden's life, and the people will believe indeed.