Da Vinci’s first quality opaque watercolors are specially formulated for designers and professional artists. Permanent, non-toxic pigments are carefully dispersed in a natural gum to create brilliant colors. Artists quality conforms to ASTM D- 5724. Huge 37ml size. Sold individually or as a box of three. Also available in color sets of 6 or 10. Made in USA. Lightfastness (resistance against fading) I (excellent), or II (very good).