Annealing is a heat treatment process used to make materials like glass or metal more durable and less brittle. In glassmaking, annealing involves slowly cooling the glass after it has been shaped to relieve internal stresses that could cause it to crack or break. The glass is placed in a special oven called an annealing kiln, where it is gradually cooled over several hours or even days. This controlled cooling process ensures the glass is stable and strong. In metalworking, annealing softens the metal, making it easier to work with and improving its overall strength.

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