Skiopticon image from the Department of Photography at the Royal Institute of Technology. Use by Professor Helmer Bäckström as teaching material. Bäckström was Sweden's first professor in photography at the Royal Institute of Technology 1948-1958. Stairwell. The image is written: NA2 SA2 O3 + HCl. For more info: see the photographic manual of Helmer Bäckström. Nature and Culture. Other revised edition 1958-59. Chapter 75-79 toning procedures for silver images (page 585 and following).

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Size: 2135px × 2340px
Photo credit: © BTEU/TEKNISKA / Alamy / Afripics
License: Licensed
Model Released: No

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