Titel
Highly Photosensitive Daguerreotypes and their Reproduction: Physico‐chemical Elucidation of Innovative Processes in Photography Developed around 1840 in Vienna
Autor*in
Abstract
A physico‐chemical elucidation of the first photographic technology that allowed manifold reproduction is presented. An etched daguerreotype manufactured around 1840 in Vienna, preserved by the Technisches Museum Wien, served as a case study. Surface analysis showed that the photographic process involved the formation of colloidal Ag nanoparticles with sizes of 30–120 nm with shell layers consisting of Ag2O, Ag2S, and some AgCl. This breakthrough photographic technique provided a hitherto unachieved high sensitivity because of various halogenide mixtures without the use of Hg. The image development consisted of the reduction of the Ag halides by H2SO3 created by the hydrolysis of S2Cl2 leading to the formation of Ag nanoparticles adjacent to the Ag nuclei of the latent image. The fixing of the image was performed either by KCN or by Na2S2O3. The investigated plate exhibits etched areas with Ag2O conversion layers and no Cl or S. The gum arabic use for etching preferentially wetted the exposed Ag nanoparticle regions so that unexposed areas could be etched by HNO3.
Stichwort
daguerreotypesheritage sciencephotochemistryphotographynanoparticles
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
phaidra.univie.ac.at/o:1083746
Erschienen in
Titel
ChemPlusChem
Band
84
Ausgabe
11
Seitenanfang
1730
Seitenende
1738
Publication
Wiley
Erscheinungsdatum
2019
Zugänglichkeit
Rechteangabe
© 2019 The Authors
Universität Wien | Universitätsring 1 | 1010 Wien | T
+43-1-4277-0