A protective coating or lining of clay or similar material applied to the inside of a furnace or crucible during glassmaking or metalworking.
From French 'brasque,' possibly related to 'braser' (to solder or braze). The exact origin is uncertain but may relate to ancient metallurgical practices.
Brasque is the 'sunscreen' for furnaces—glassmakers coat the insides of their hot containers with this clay mixture to prevent the intense heat from melting the container itself, letting them melt glass or metal inside without destroying their equipment.
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