Holbein DUO Aqua Oil is an artist quality pigment in water-soluble linseed oil with all the handling characteristics of traditional oil and so much more. Duo is a wonderfully versatile product manufactured to Holbein standards of production control, reliability, light fastness, color vigor and technique handling control. Duo reproduces the characteristics of traditional oil color, and finishes with the same texture and brush strokes. Duo eliminates the odor of solvent from the studio and brushes. Duo colors dry uniformly in as little as 24 hours. The drying capabilities are not diminished by a cold environment.