query: material_used chop suey 
supports: Etching is traditionally the process of using strong acid or mordant to cut into the unprotected parts of a metal surface to create a design in intaglio (incised) in the metal. In modern manufacturing, other chemicals may be used on other types of material. As a method of printmaking, it is, along with engraving, the most important technique for old master prints, and remains in wide use today. In a number of modern variants such as microfabrication etching and photochemical milling it is a crucial technique in much modern technology, including circuit boards.  Chop Suey ( 1929 ) is a painting by Edward Hopper . The foreground of the work portrays two women in conversation at a restaurant . Oil painting is the process of painting with pigments with a medium of drying oil as the binder. Commonly used drying oils include linseed oil, poppy seed oil, walnut oil, and safflower oil. The choice of oil imparts a range of properties to the oil paint, such as the amount of yellowing or drying time. Certain differences, depending on the oil, are also visible in the sheen of the paints. An artist might use several different oils in the same painting depending on specific pigments and effects desired. The paints themselves also develop a particular consistency depending on the medium. The oil may be boiled with a resin, such as pine resin or frankincense, to create a varnish prized for its body and gloss. Edward Hopper (July 22, 1882  May 15, 1967) was a prominent American realist painter and printmaker. While he was most popularly known for his oil paintings, he was equally proficient as a watercolorist and printmaker in etching. Both in his urban and rural scenes, his spare and finely calculated renderings reflected his personal vision of modern American life.
candidates: drying oil metal oil oil paint walnut
answer: oil paint