By: Angela Vanderbilt
The first delivery of scans depicting the 1920s subway construction project has arrived. These scans were made from a set of highly sensitive nitrate-based negatives, which are being digitized first due to their state of deterioration. A variety of factors have contributed to this deterioration, including the physical composition (an unstable silver nitrate emulsion held on a celluloid surface), age (many are from the 1920s-1930s), and environment (negatives had been stored in a location with dramatically fluctuating temperature and humidity levels prior to being stored at UC’s ARB repository), so it’s important to have them scanned as soon as possible. For safety reasons, the nitrate negatives will be destroyed once scanning is completed and image files are approved. Following the nitrate scanning, acetate-based negatives will be scanned. These negatives are also deteriorating due to similar factors but do not pose safety issues like the nitrate negatives, apart from their offensive vinegar smell…Following the negatives, the collection of prints will be sent for scanning. When completed, we will have over 8000 digital images of the subway and street improvements projects, images portraying Cincinnati from the 1920s through the 1950s, with over half produced as positive images from negatives.