Glossary of Photographic Techniques & Terms
BROMIDE PRINT – Traditional photographic paper – Coated with Gelatin containing silver bromide – giving a cold black and white image.
CHLOROBROMIDE PRINT – B/W paper containing a mixture of silver chloride and silver bromide giving a warm brownish black image.
BROMOCHLORIDE PRINT – B/W paper with a mixture of silver bromide and silver chloride giving a warmish black brown image.
TONING – B/W image treated to give a variety of tones – Blue, Yellow Brown, Brown, Purple Brown, Gold, Selenium.
MULTIPLES – Numerous images exposed on one negative.
SOLARISATION – The Sabattier effect – discovered by Armand Sabattier (1834-1890) – A partially reversed image giving a negative/positive linear effect.
CLASSIC PHOTOGRAPHY – Term given to the following nineteenth century photographic techniques:
CYANOTYPE - Invented by Sir John Herschel in 1842 - known as the "blue print" process, a blue photographic image on water colour paper. Also used for many years for duplicating technical drawings.
GUM BICHROMATE PRINT – Successfully introduced in 1894 – Gum Arabic dissolved in water with a water based pigment and either potassium or ammonium dichromate, coated onto water colour paper or any other suitable base.
KALLITYPE or VAN DYKE PRINT – Introduced circa 1898 by W.J. Nichol based on the experiments of Sir John Herschel – sensitised water colour paper resulting in a Van Dyke Brown Photographic image.
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