Silver mirroring is the most common type of damage that appears in historical photographs on gelatin developing-out paper (DOP) and black-and-white films. Addressing the problem is potentially so problematic that it is often left untreated.
A new method for it, developed by Jordi Mestre and explained in detail in an article by J. Mestre, J.M. Vergès and R. Udina, will make this extraordinarily delicate and little-used procedure a common one within the photographic conservation community.
Mestre’s approach to this problem is based on two considerations:
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