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hollow metal utensils and artifacts. The simplest metalwork technique for making hollowware is to join pieces of sheet metal together, using rivets, solder, or other means. A riveted bucket is a simple example. Raising, a technique dating from at least the 3rd millennium BC, is commonly used for hollowware in silver, copper, and other malleable metals: a disk of sheet metal is gradually shaped into a hollow form over a stake or anvil by a series of hammer blows spiraling from the centre of the convex side; the hammer marks are later removed with a smooth, planishing hammer