annealing
An*neal"ing, n. 1. The process used to render glass, iron, etc., less brittle, performed by allowing them to cool very gradually from a high heat. 2. The burning of metallic colors into glass, earthenware, etc.
An*neal"ing, n. 1. The process used to render glass, iron, etc., less brittle, performed by allowing them to cool very gradually from a high heat. 2. The burning of metallic colors into glass, earthenware, etc.