Abstract:
In 2009 the Centre de conservation du Québec received a request for restoration of a composite
photographic object from the collection of the Colby-Curtis Museum in Stanstead, Quebec. The
object consists of twelve photographs mounted together in a wooden frame and includes daguerreotypes and ambrotypes; the brass mats of the individual photographs showed signs of
corrosion. Before undertaking the restoration, three methods of corrosion removal were studied:
the Rosenberg method of galvanic corrosion, local electrolysis and, lastly, localized application
of an ion exchange resin, in this case Amberlite IR120 H. This article details the three methods
and describes the results of the treatment method chosen using the ion exchange resin.