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panel C1 internal side, reflected light
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panel C1 internal side, transmitted light
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panel C1 external side, reflected light
The glass is early 20th century that has been etched on both sides to resemble medieval corrosion. The panel was re-leaded in the 1970s conservation. At this time, a clear resin-like substance was applied to the entire back of the panel as well as over some of the trace lines on the front, presumably as a consolidant / protective layer.
The composition of the coating on the external surface is very similar to Viacryl®. The composition of the coating on the Internal surface is slightly different to that on the external. The composition of the internal coating is a mixture of Viacryl®, Primal® and another polymer.
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