Made in the USA ASTM lightfastness rating excellent Semi-Transparent Artist quality Uniform drying time and surface appearance. These professional quality oil paints feature superb color strength, reliable lightfastness and a uniform buttery consistency. The pure pigments are procured from sources around the world. The high-grade alkali-refined linseed oil used to create the paint is selected for its uniformity, light color, low-acid value, low-yellowing and good adhesion properties. Each batch is made by hand, with the utmost integrity and attention to detail.