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grit tempering
CATEGORY: ceramics
DEFINITION: The addition of small pieces of rock or sand to the paste used in creating a ceramic object.
grog tempering
CATEGORY: ceramics
DEFINITION: The addition of small pieces of crushed ceramic to the paste used in creating a ceramic object.
shell tempering
CATEGORY: ceramics
DEFINITION: The addition of small pieces of crushed shell to the paste used in creating a ceramic object.
tempering
CATEGORY: geology; ceramics
DEFINITION: One of the processes in the manufacture of steel and other metal artifacts, the heat treatment of hardened steels to improve toughness and reduce brittleness. The steel is reheated to a temperature of around 450? C and then rapidly cooled by quenching. Also, the material added to the paste of a ceramic to make it stronger and give it properties it does not naturally have.

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