A dispersion of pigments in a synthetic acrylic resin produced from acrylates and/or methacrylates. Acrylic paint dries as the liquid vehicle evaporates, and the resulting polymer-chains then deform and coalesce to form the paint film. While acrylic paints are generally thought to be very fast drying, thick applications may take months or even years to fully dry. Artist acrylic paints were first made in the 1950s using poly (n butyl methacrylate) resin dissolved in solvent (mineral spirits or turpentine) with pigments and other minor components. The next type developed in the 1960s was the acrylic emulsion paint that remains so popular today. These are thinned (and brushes cleaned) using water; however, once dry, the paint films are water-resistant.