Winsor & Newton Artisan Water Mixable Mediums, Impasto is an impasto and texturing medium for use with Artisan water-soluble oil colors. This stiff, quick-drying medium retains brush marks when mixed with Artisan Colour. Mixed thoroughly into the color, it will build into multiple thick layers and speed the drying time. Resists yellowing, it can be cleaned up with water. Details:Available in multiple sizesResists yellowingCan be cleaned up with water.