Talens Ecoline Brush Pen Set of 10 Illustrator is based on dyes and Gum Arabic. The colors of Talens Ecoline are astonishingly bright and brilliant. If you wish, you can easily decrease the color intensity through thinning with water or with a blender. The set includes light yellow, deep yellow, pastel rose, yellow ochre, vermillion, turquoise green, forest green, ultramarine deep, ultramarine violet and indigo.