Holloware refers to tableware that has depth, commonly used as receptacles, such as teapots, serving bowls and pitchers. It is made of different metals, including nickel, brass or silver, and is a valued collectors item, according to Railroadiana Online.
Simple holloware is made by bonding sheets of metal together with rivets or solder. A technique dating to the third millennium B.C. called raising is used in metals that are malleable, such as copper or silver. The metal is hammered into the desired shape and smoothed with a planishing hammer. Casting and spinning are additional techniques used to cast holloware pieces that are unsuitable for hammer work.