This kit includes top-quality pigments, sustainably harvested from around the world. Each one has been carefully ground to enhance the beauty and luminosity specific to each pigment. They provide a texture, radiance, and subtlety of color that synthetic pigments simply can’t give. These paints are free of fillers, additives, synthetic preservatives, toxins, petroleum-based pigments, and heavy metals. Simply mix pigments with walnut oil using a palette knife, or for more thorough mixing, finish with a glass muller.