Agenda

30 Gen 2017 14:30

Solvent cleaning of silver gelatin prints, is it safe?

Campus Scientifico via Torino - edificio DELTA, Aula 2C

dr.ssa Maha Ahmed Ali, lecturer at Cairo University, Conservation Department-Faculty of Archaeology, Giza, Egypt

Abstract:
Photographs often suffer from damage as a result of improper and frequent handling. Moreover, particulates, which may be greasy, grimy, abrasive, and chemically or biologically active, settle on shelves and on collection materials causing both physical and chemical damage. Accordingly, photographs may benefit greatly from surface cleaning treatments. Treatments chosen for this experiment were based on the following solvents: acetone, toluene, ethyl alcohol and isopropyl alcohol. Changes promoted in the binder and image silver, as a result of these treatments, were measured in order to evaluate the benefits and potential problems of each treatment and estimate if they can be used without unacceptable change in the original image now and in the future. The tests are based on the consideration of the following criteria: changes in the surface characteristics through digital imaging, atomic force microscopy (AFM); changes in the density of image silver through densitometric measurements; changes in the chemical structure of the gelatin binder through attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), changes in pH value, changes in color and gloss through spectrocolorimetric measurements; And disturbance of the binder (i.e. ninhydrin test). Data obtained from naturally and artificially aged samples were compared with those of the control samples.

 

Lingua

L'evento si terrà in italiano

Organizzatore

Dipartimento di Scienze Ambientali, Informatica e Statistica - Elisabetta Zendri

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