IADA event Workshop

Photoreproductions: Identification and Conservation

6th October 2022 — 7th October 2022

Lecturer: Hildegard Homburger 

Language English 

Participants: 8 

Next dates: Berlin, 6.-7. October 2022 

Registration: h.homburger(at)t-online.de 


Until the introduction of computers photoreproduction was the common means to copy architectural drawings. These copies are found in architectural collections as well as archives, but also in art collections. 

Photoreproductions are contact copies, which are produced based on the effect of light but without photographic equipment. 

This technique was used to produce equal-sized copies of technical drawings. They were made by taking a technical drawing which had been drawn on translucent material and placing it directly against a photosensitised sheet and exposing it to light. The light sensitive carrier was most often paper. The components of the chemical solutions within the sensitized layers of these photoreproductions vary depending on the copy process. 

The chemical composition of the light sensitive components of these copies and the resulting sensitivity towards light and environmental conditions require special attention and care when considering storage and exhibition. 

In the seminar the major photoreproduction processes, (Cyanotype, Vandyke print, Ferrogallic print, Diazotype, Silver gelatine contact print, Gel lithography, Negrography), will be explained historically and technically. 

The two days provide an opportunity to look at a great number and variety of original copies under magnification and to exercise the identification of their techniques. 

A separate part will focus on the conservation (storage, exhibition and treatment) of these different photoreproductions. 

320,- € IADA-members 
360,- €