Film, Darkroom & Historic Processes — 8 Terms Defined

Safelight Film, Darkroom & Historic Processes nm A darkroom lamp emitting only wavelengths to which the material in use is insensitive.

Selenium Toning Film, Darkroom & Historic Processes dilution ratio A treatment that converts silver to silver selenide, deepening blacks and giving prints a subtle cool or purplish shift.

Sepia Toning Film, Darkroom & Historic Processes A chemical treatment that converts a print's metallic silver into silver sulphide, producing warm brown tones.

Silver Halide Film, Darkroom & Historic Processes The light-sensitive compounds — silver bromide, chloride and iodide — that form the active ingredient of photographic emulsions. AgBr, AgCl, AgI

Solarisation Film, Darkroom & Historic Processes seconds A partial tonal reversal produced by briefly exposing a print or negative to light part-way through development.

Split-grade Printing Film, Darkroom & Historic Processes seconds per filter Exposing a variable-contrast print twice, once through a soft filter and once through a hard one, to control highlights and shadows separately.

Stand Development Film, Darkroom & Historic Processes minutes A technique using very dilute developer and almost no agitation over a long period, typically an hour.

Stop Bath Film, Darkroom & Historic Processes seconds A mildly acidic solution used after development to halt the process immediately.