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Abstract
The composition of mediaeval glass and the manner of its decay are reviewed, and the composition and physical properties of decayed glass are contrasted with those of unaltered glass. The importance of correct packaging and the storage environment in preventing deterioration after excavation are emphasized. Techniques of examination and recording decorated fragments using transmission X-radiography, xero-radiography and electron emission radiography are described. The use of a 5% solution of ethylenediaminetetra-acetic acid disodium salt is recommended to remove the dark staining from decayed glass fragments, and preliminary experiments in consolidating decayed glass with tetraethyl orthosilicate are described. Examples are presented where it has proved possible to restore the original appearance of a destroyed window by examination of the leadwork and the surviving glass fragments.