The Chelsea Classical Medium, Clarified, Pale, Cold-Pressed Linseed Oil undergoes a multitude of steps and processes to achieve its Professional level of purity. This linseed oil is washed and de-yellowed by traditional, Natural processes that strive to make the palest, cleanest pure linseed oil for artists' Use.Cold-Pressed Linseed Oil is traditionAlly known as the best extracted linseed oil, as opposed to pressing extractions by heat or chemicals. This Professional-Quality linseed oil will not darken like traditional linseed oils and provides brighter and richer tones and hues when Used with oil Colors.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. Chelsea classic studio mini sampler oils 2x1oz bottle