Clear Painting Medium is a combination of Zest-it and Linseed Stand oil. It reduces consistency and enhances the flow of paint. Oil colours can be added to the Clear Painting Medium where a coloured ground is required for paining wet-on-wet. It is also very useful for thinning transparent colours when glazing and, as it does not contain varnish, glazes do not yellow over time. The Zest-it Painting Medium dries to a tough film.