Antifoggant (photo laboratory technology)

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An anti-fogging agent is an adjuvant in the development of analogue photos . Antifoggants, also known as retarders , serve to avoid blurred, blurred prints mixed in the actual developer solution. Fogging occurs when exposed silver bromide crystals touch neighboring, unexposed crystals due to the formation of threads and thereby activate them. Too long development times can be a reason for fogging.

Potassium bromide , sometimes also thiosulfate or thiocyanate, is used as an anti-fogging agent . Benzotriazole with diethylene glycol can be used for overlaid photo papers . The formation of fog is prevented by two effects:

1. By delaying development
2. By keeping the potential difference constant

Individual evidence

1. ↑ FJL-Fotodesign.de - photo glossary - directory. Accessed on June 24, 2019 . 
2. ↑ The negative development process. Retrieved June 24, 2019 . 
3. ↑ Laborlexikon: G. Retrieved June 24, 2019 . 
4. ↑ ^{a b} Prof. Blum's media offer: photography. Retrieved June 1, 2019 . 
5. ↑ Werner Baumann, Elke Kahler-Jenett, Barbara Schunck: Photo chemicals: data and facts on environmental protection . Springer-Verlag, 2013, ISBN 978-3-642-97208-9 ( p. 17 in the Google book search).
6. ↑ RESTRAINER NEUTRAL. (PDF) In: Fotoimpex Berlin. Moersch Photochemie, January 15, 2010, accessed on June 24, 2019 .