Abstract
This article describes some of the factors associated with the deterioration of ancient silicate glasses. On the basis of this model, a procedure is proposed for the conservation of an assemblage of excavated, wet, painted medieval window glass fragments. The fragments had been stored wet since excavation and needed to be consolidated for longterm storage in a way that was inexpensive, quick, and safe. The proposed treatment removes the water with ethanol and consolidates the fragments with Paraloid B-72 (an acrylic polymer) dissolved in a mixed ethanol and acetone solvent system. Examination of the stored samples five years after this treatment indicates that the method appears successful.
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