Painter's medium is a term used to describe the materials used by painters to create their artwork. The most common painter's mediums are OIL, tempera, ACRYLIC, and oils. OIL is a slow-drying liquid made from pigments suspended in a drying OIL such as linseed or walnut OIL. Tempera is a fast-drying paint made from pigments mixed with an egg-based binder. ACRYLIC is a water-based paint made from pigments suspended in an ACRYLIC polymer emulsion. Oils are a combination of OIL and pigment that can be used to create a variety of effects.