Th e article presents issues related to the collection of over 200 collodion negatives made on a glass support in the so-called wet collodion process, housed in the Kórnik Library of the Polish Academy of Sciences in Kórnik. It describes the collodion process, which was invented in 1851, the characteristics of collodion negatives, and the themes presented on objects from the Kórnik collection. It subsequently discusses the characteristic damages of collodion negatives, with the most dangerous deposition of alkaline compounds on the surface of the glasses, which causes the destruction and loss of the image layer. It further presents the preservation activities carried out on the objects from the Kórnik collection including conservation treatments, photographic documentation, and photographic prints from the originals (1:1) on highly sensitive bromosilver-gelatin paper toned with selenium and Digigraphie prints. In conclusion, attention is drawn to the necessity of the continuation of research, conservation and restoration works on the collection of negatives.