What art media did Richard Allen use in the op art painting called X?

Richard Allen's op art painting titled "X" primarily employs acrylic paint on canvas, a common medium for achieving the vibrant colors and crisp lines characteristic of the op art movement. His work often features geometric patterns and optical illusions, engaging viewers by creating a sense of movement and depth. The precise application of paint contributes to the overall visual impact, enhancing the dynamic quality of the artwork.