Duo is an oil paint that dissolves in water. It can be softened or diluted with water. Ateliers are always comfortable because they can be produced without the use of volatile solvents. Also, with a duo that has been dissolved in water, you can create expressions that were not possible with conventional oil paints. For example, it is a paint that further expands the possibilities of oil painting, such as hatching with thin and dark line drawing, and skin that makes use of the flow and bleeding unique to water. Oil paint beginner set that melts in water (from Discovery Japan)