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In art, the term "medium" refers to the materials and techniques used by a painter. This includes the pigments, the liquid binder that makes them workable, the support or surface, and the tools employed.1234

Different mediums have distinct expressive capacities and final textures. Pigments, the colored powders in paint, come from natural or artificial sources. Historically, pigments were limited, with rare minerals like lapis lazuli being expensive and reserved for important details. Trade and synthetic substitutes have since expanded the available color palette.1234

Some artists use "mixed mediums," combining different materials within a single artwork. Examples include Renaissance tempera-oil techniques or contemporary artists using photographs overpainted with oil color. Other mediums include ink, widely used in East Asian art for its tonal variations, and synthetic mediums like acrylic resin emulsion, which offers the versatility of oils with the quick-drying properties of tempera. Mechanical mediums, such as computers and film, and even language itself, have also been explored by artists.1345

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