Not commercially distributed.
Glass artist William Gudenrath describes the techniques used to make a core-formed vessel. Ancient glassmakers discovered a technique called core forming. A core was formed from dung and clay, then dried. The core was covered with glass. After cooling, the core was scraped out. The bottles were used for perfume and cosmetics
Narrator, William Gudenrath, resident advisor, The Studio, The Corning Museum of Glass.
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Mode of access: internet.