Large metal spoon with a half-sphere-shaped end that is used to extract molten glass from the crucible. Usually, the molten glass is used for piastra works.
In glassmaking terms it is a large ladle (in Tuscany it is called in fact, romaiolo), like a large metal spoon, shaped like a meza bala (half sphere), which is used to extract from the crucible inside the furnace the molten material.
The cassa is used to clean out, by emptying them, a crucible or paela or in plate processing, to extract the glass mass necessary for the processing itself.
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Glossary
