Skioptikonbild from the Department of Photography at the Royal Technical University. Use of Professor Helmer Bäckström as a teaching material. Bäckström was Sweden’s first professor of photography at the Royal Technical College. 1948-1958. Motif depicting a girl in a stroller. The pictorial is written Betad in rodan cups. Tinted in tioflavin. After toning rinsing...... (obscure text see picture). For more info: see Photographic Handbook by Helmer Bäckström. Nature and Culture. Second revised edition 1958-59. Cape. 75-79 Toning procedures for silver pictures (pages 585 et seq.)


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