Dalle-de-verre
Historic England 2020 Stained Glass Windows: Managing Environmental Deterioration, Swindon, Historic England, published in 2020 defines dalle-de-verre, or prismatic glass comprises: “Thick slabs of cast glass, moulded or chipped into shape with facets to refract the light, and set in concrete or resin; popular for 20th-century architecture. Also known as prismatic glass.”
It suggests that “This technique was used to form some of the most dramatic and important stained glass in the periods before and immediately after World War II, but as with all innovative systems, it can sometimes present serious conservation challenges.”
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