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terminology

Core forming

The technique of forming a vessel by winding or gathering molten glass around a core supported by a rod. After forming, the object is removed from the rod and annealed. After annealing, the core is removed by scraping.
See Youtube ‘Schitterend Glas 1: zandkern techniek’
See YouTube ‘Glassmaking Technique: Core-Formed Glass’

source Corning Museum of Glass

alternate terms

Coreforming, Core formed, Core-formed, Core form, Coreform, Core forms