The Chelsea Classical Medium, Clarified Pale Cold-Pressed Walnut Oil, is cleaned by hand and made with only Natural ingredients. This walnut oil is washed by traditional, Natural processes that strive to make the palest, cleanest, and most pure walnut oil for artists' to Use. The mucilage and fat is removed, which greatly improves the acidity and drying of the oil. It is then further cleaned by multiple processes that filter out the remaining impurities and unnecessary Coloration. This Professional-Quality walnut oil will not darken, and provides brighter and richer tones and hues in oil Colors.Walnut oil is NaturAlly less yellow and dries slower than Linseed oil. For best results, we recommend using it for whites and light Colors! What: Hand cleaned and purified Walnut Oil; washed and cleaned by traditional methods. Why: Improves richness and brightness of whites and light Colors; dries slower than linseed oil. Free of fats and impuritiess Use with whites & light Colors