Imaging Science and Photochemistry ›› 2020, Vol. 38 ›› Issue (1): 9-14.DOI: 10.7517/issn.1674-0475.190609

• Review and Articles • Previous Articles     Next Articles

Effects of Mold on the Back Coating of Photographic Negatives

QI Yunpeng1,2, WANG Yong1,2, HE Yu3, ZHANG Xiaolin3, TIAN Yi3, ZHOU Yajun1,2, JIA Zhihui1,2, LI Yuhu1,2   

  1. 1. Engineering Research Center of Historical Cultural Heritage Conservation, Ministry of Education, Shaanxi Normal University, Xi'an 710119, Shaanxi, P. R. China;
    2. Shaanxi Cultural Heritage Conservation and Environmental Protection Engineering Technology Research Center, Xi'an 710119, Shaanxi, P. R. China;
    3. China Film Archive, Beijing 100082, P. R. China
  • Received:2019-06-18 Online:2020-01-15 Published:2020-01-15

Abstract: Mildew is one of the common diseases of photographic negatives, which seriously affects the 9 integrity and clarity of its recorded information and endangers its long-term preservation. In this paper, the surface morphology on the back coating of moldy photographic negatives were studied by Keyence VK-X250K laser confocal microscope, and the surface roughness parameters such as arithmetical mean height (Sa), maximum height (Sz), texture aspect ratio (Str), arithmetic mean peak curvature (Spc), developed interfacial area ratio (Sdr) were tested. The results showed that the back coating of the film is seriously eroded by mold after mildew, forming a rough and uneven surface. This rough surface is one of the main reasons for the damage of the clarity and integrity of the photographic negative records image information.

Key words: photographic negative, mold, back coating, roughness