Developed by Holbein in 1999 to offer the same high pigment quality and archival characteristics of Holbein’s Artists’ Oil line while allowing soap-and-water cleanup, Duo Aqua Oils are characterized by rich hues, high chroma, excellent lightfast ratings equivalent to that of traditional oil color and superior working characteristics. Holbein specifically details 17 colors as “Elite” colors that contain heavy metal pigments like cadmiums and cobalts. DUO offers 100 highly pigmented Artist Grade Colors suspended in a water soluble, Refined Linseed Oil. DUO is compatible with all media including traditional oil color and mediums, watercolor, gouache, acrylic gouache and acrylic. DUO is an excellent teaching tool and a superb printmaking ink.