The University of Cologne’s Theater Studies Collection (TWS) has an extensive photographic collection with around 290,000 photographs from the mid-19th century to the present day. In 2014-2016, 1,789 historical glass negatives were digitized and described in cooperation with the Rheinisches Bildarchiv and the Cologne museum department. They are also visible in the TWS ‘own database at http://bestand.tws.uni-koeln.de/.