Magna is the brand name of an acrylic resin paint, developed by Leonard Bocour and sold by Bocour Artist Colors, Inc. in 1947.
In 1960, Bocour Artist Colors developed a water-borne acrylic paint named Aqua-Tec.
Modern acrylic paint is water-soluble, while Magna is miscible with turpentine or mineral spirits, though both can dry rapidly to a matte or glossy finish.
[1] It was used by artists such as Barnett Newman, Morris Louis, and Roy Lichtenstein.
Golden Artist Colors produces Mineral Spirit Acrylics[4] as a direct replacement for Magna.