Alvin Watercolor Napthol Red 37ml uses only ASTM pigments. This gives the paints a brilliant color and light fast quality. These water colors are rated the best in the world and made in the United States. When working on paintings for profit or hobby why not purchase the best. They do not fade and come in transparent, semi-transparent, opaque, and semi-opaque. It doesn't fade so it lasts many years.