Bervase: A Field Guide to Kiln-Fired Glass

Field notes

Bervase organizes kiln glasswork around material records and firing decisions rather than finished objects. It advises recording the glass family, manufacturer, thickness, surface treatment, and firing-run date, and describes testing unknown shards as narrow strips viewed between polarising filters after a kiln cycle. The guide distinguishes glass families such as 90 and 96 from universal physical measurements, and warns that incompatible work may fail only weeks later or when it reaches a grinding wheel.