Bromide silver print
Silver bromide printing or rotary photography is a historical copying process for the mechanical production of black and white photographic prints. From 1892 until the spread of offset printing around 1920 and beyond, it was one of the most important manufacturing processes for postcards . In particular, the Neue Photographische Gesellschaft had rendered outstanding services to the development of the printing process.
The bromide silver printing does not print in the literal sense; - in the paper guide based on the rotary printing - photo paper wound on rolls and coated with gelatine containing silver bromide is automatically drawn under mounted halftone negatives , exposed, developed, fixed and dried.
Since in the case of bromide silver printing, reproduction losses only arise through the duplication of the original negative, but the gray gradations are still produced by the film grain and do not have to be simulated by screening, as with letterpress and offset printing, it is characterized by particularly fine gray drawing and richness of detail.
literature
- Fritz Loescher: Rotationsphotographie , in: Mother Earth. Technology, travel and useful observation of nature in the home and family. First volume. W. Spemann, Berlin and Stuttgart 1899, pp. 281–284 (fig.)