The brand name of an acrylic resin paint developed by Leonard Bocour in 1947 and sold by Bocour Artist Colors, Inc. Magna dries rapidly, producing a matte or glossy finish, and unlike modern acrylic paints, it can be diluted with turpentine and mineral spirits. It was used by mid-20th-century artists Roy Lichtenstein, Barnett Newman, Morris Louis, and Kenneth Noland, among others.

Print advertisement for Magna. Late 1940s.