Each brand of paper may have a different initial characteristic curve and graded paper curves will be different than variable contrast paper curves. The shape of the curve can be altered by different developers, development times, temperatures, and toning . Processing times are shorter than for other papers, but the paper may not be as archivally permanent. Shadows are represented on a negative by sparse deposits of black metallic silver, reproducing as the dark areas on a print. Silver Halides Generic name for a group of light sensitive compounds of silver combined with a halogen, such as bromine, chlorine, iodine, or fluorine.
Silver halides change from white to black metallic silver when exposed to light.
Commonly used with graded papers to achieve intermediate grades, that is, to soften the contrast . Stop Bath Acid solution used after development to instantly arrest further development. Tone A black and white photograph is made up of a series of gray tones. Controlling these tones allows us to control the nature of the photograph, both emotionally and technically. Since the number of gray tones is so large it needs to be broken down from a continuous range to a series of distinct zones.