Tannin process
The tannin process (also tannin dry collodion process or tannin process ) is a process from the field of photography that replaced the Taupenot process .
In 1861 the Englishman Major Charles Russell (1820-1887) published a photographic process that worked with dry plates, based on the collodion emulsion . It was further developed in the following years and used in different variants.
In principle, the glass plates were provided with an adhesive layer ( gelatine or rubber ), on which a collodion emulsion was applied, which was then treated with a tannin solution . A layer of gelatin could be added on top of that, which acted as a protective layer and prevented the pores from closing when the collodium dried. The tannin caused a significant increase in sensitivity, so that these drying plates almost reached the sensitivity of the wet collodion plates.
The shelf life was about 6 months, which was an invaluable advantage compared to the good, but very awkward to use collodion wet plate . The collodion dry plate was replaced by the gelatine dry plate from around 1878 .
Web links
- Thomas Sutton: photography on glass. About Russell's Tannin Process. In: Photographic Journal. Vol. 16, No. 1, 1860, ZDB -ID 880968-9 , pp. 4-6.
- About the process with tannin by Russell. In: Photographic Journal. Vol. 16, No. 1, 1860, pp. 7-8.
Individual evidence
- ↑ Dry collodion processes (photographic negatives) ( Memento of the original from January 23, 2017 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Photo Web Glossary
- ↑ John Hannavy (ed.) Encyclopedia of nineteenth-century photography. Volume 1: A - I, index. Routledge, New York NY et al. 2008, ISBN 978-0-415-97235-2 , p. 440.
