Cyanotype: toning experiments

Cyanotype which after development was toned with black tea (Ostfriesentee).

 Bleached with borax and than toned with black tea (Ostfriesentee).

Cyanotype  bleached in diluted Rodinal solution and afterwards toned with black tea (Ostfriesentee). (–> Black)

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Same negative, same paper (Boesner LineArt224 ) and same sensitizer solution  (J. M. Eder: Rezepte, Tabellen und Arbeitsvorschriften für Photographie und Reproduktionstechnik, Verlag von Wilhem Knapp, Halle (Saale), 1942, 18.-19. Auflage, p.225).

Exposure times vary:  4′, 2′ and 5′ .