Entertainment / Photography Glossary

Positive: In photography, the production of prints or transparencies in which light and dark correspond to the tonal range of the original subject.

Positive Lens: Simple lens that causes light rays from a subject to converge to a point.

Positive-Positive Printing: Process for printing a color transparency directly on paper to produce a positive print.

Posterization: Photographic technique using a number of tone separated negatives which are printed on high contrast material. A master negative is made by printing these in register. The final print from t . . . View Full Definition

Potassium Bichromate: Chemical used in chrome intensifiers.

Potassium Bromide: Chemical used as a restrainer in most developing solutions and as a rehalogenizing agent in bleaches.

Potassium Carbonate: Highly soluble alkaline accelerator used in most general purpose and print developing solutions.

Potassium Chloride: Chemical used in some bleaches and sensitizers.

Potassium Citrate: Chemical used in blue and green toners.

Potassium Dichromate: See potassium bichromate.

Potassium Ferricyanide: Chemical used in farmer's reducer as a bleach.

Potassium Hydroxide: Caustic potash. Highly active alkali, used as the basis for high contrast developing solutions.

Potassium Iodide: Chemical used in bleaches, toners and intensifiers.

Potassium Metabisulfite: Acidifier used in fixers and stop baths.

Potassium Permanganate: Chemical used extensively in reducers, bleaches and toners.

Potassium Persulfate: Chemical sometimes used in super-proportional reducers.

Potassium Sulfide: Chemical used in sulfide toning.

Potassium Thiocyanate: Chemical used in some fine grain developers as a silver solvent.

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