Artists' Watercolors by Winsor & Newton are made from the finest and widest range of pigments with the highest pigment strength and greatest transparency. As a result of their strength and brilliance, the artist can mix stronger washes using less paint. Each color is formulated individually with single pigments when possible to ensure cleaner, brighter mixes. All colors are classified as permanent and only aureolin, gamboge genuine, cobalt blue deep, and cobalt violet bear the ACMI Caution Label. Item #242701