Experimenting with cyanotypes. Recipes from an old book I bought as a secondary schoolboy:
J. M. Eder: Rezepte, Tabellen und Arbeitsvorschriften für Photographie und Reproduktionstechnik, Verlag von Wilhem Knapp, Halle (Saale), 1942, 18.-19. Auflage.
A book full of funny stuff!!
cyano, bleached in NaOH, toned in coffee
image from CT negative
More old techniques: cliché-verre
cyano, bleached in NaOH, toned in coffee
A combined print from CT negative and transparent from positive photo of letterpress metal furniture. Same technique.
Similar, but bleached with Na2CO3:
More, this time cliché-verre and CT:
Carlo Krier 