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New Designs		Conservation. One of the problems often faced with medieval glass is that of corrosion. There are several factors that contribute to it. It has been shown that condensation substantially accelerates this process and consequently one of the tools in the conservators armory against this process is a form of protection known as isothermal glazing. A panel that has been isothermally glazed is one that is seated in a bronze frame a couple of inches inside of the original location of the window. Taking the place of the panel in the original rebate or groove that once housed it is a leaded light of clear glass whose leads follow the major leads of the panel to be protected. There is an air flow permitted which ensures that all surfaces of the isothermally glazed panel are at the same temperature thus inhibiting condensation. Isothermal glazing also reduces progressive enamel and paint loss in later glass. Below are two examples of conserved 16th century glass from the Bodelian Library in Oxford. The left hand images are before conservation and the right hand images are after conservation.  This heraldic stained glass panel from a private home in Hertfordshire was in a relatively poor condition before conservation. Some previous repairs to the window included clear glass replacement pieces where the original glass had been lost or broken and numerous unsightly repair leads. The missing areas were researched and glass chosen accordingly. These new inserts were then painted and stained to match the original glass. Where repair leads could be removed, they were and the broken pieces edge bonded using a special glass conservators epoxy resin. Some of the repair leads could not be removed because of the way the glass had been cut back by previous repairs. To compliment the panel above, The heraldic panel to the right was commissioned. These are the Arms of the present residents of the house. Great care was taken with the style of painting and choice of glass to balance the new panel with the old one and not destroy the period feel of the room that houses them both.
Restoration of Victorian Glass
Conservation (pre 19th C )
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