Deutsches Museum. Abhandlungen und Berichte. Neue Folge, Band 27. Hg. Deutsches Museum. Redaktion: Prof. Dr. Helmuth Trischler, Rolf Gutmann, Dorothee Messerschmid-Franzen.
Text engl. - Nebeneintrag. - Talbot used the term „sciagraphy“ initially for his newly invented photographic in 1839. The expression recalled the theatre practice of depicting objects through their shadows.
Text engl. - Nebeneintrag. - The author experimented e.g. with different chemical fixing agents on photographic paper negatives to obtain varying color hues, e.g. yellowish highlights when using potassium iodide.