The gradual cooling of glass or glass articles is called :

tempering

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annealing

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quenching

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galvanizing

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Solution

The correct option is B annealing
Annealing is a heat process whereby a metal is heated to specific temperature/color and then allowed to cool slowly. This softens the metal which means it can be cut and shaped more easily. Mild steel is heated to a red heat and allowed to cool slowly. Annealing alters the physical and chemical properties to increase the ductility and reduce hardness.

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Name the process in which a part of the glass is reacted with hydrogen fluoride or hydrofluoric acid to make decorative glass articles.

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