Schmincke Medium W
Schmincke Medium W is a "lean" medium for mixing oil colours with water instead of organic solvents such as turpentine or turpentine substitute, turning regular oils into water-soluble oils. Increases gloss and transparency, reduces viscosity; harmonizes drying process; odourless.
Mix 2 parts of oil colour and 1 part of medium W on a palette, than add water like you want; if necessary add more medium W. Painting tools can be cleaned with water. There is no change of the product quality based on the colour change of the raw material alkyd resin.