R

Rag - Tick layers of wet newspapers folded to provide a cool safe pad for the glassworker to shape the hot molten glass.

Reticello - {Vetro a Reticello) A type of blown glass made with canes laid in a crisscross pattern for form a net.

Ringer - the glass worker that applies the ring for glass to the larger piece.

Rondelle - A flat blown glass that was spun hot.