Quinacridone Red Magenta is a synthetic-organic pigment. It belongs to the group of quinacridone pigments. These compounds were discovered in 1935, but only gained greater importance from about 1960 onwards. Quinacridone pigments are based on a polycyclic compound with five rings. Depending on the exact chemical composition, crystal modification and degree of substitution, these pigments are available in different colors, which can range from bright magenta, reddish violet, purple to brown-orange and reddish brown.
Kremer, pigments, Color Lab, Visual + Material Resource Center