Talens Ecoline Brush Pen Set of 10 Bright 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 Lemon yellow, light orange, scarlet, pastel rose, magenta, blue violet, sky blue, green, sepia deep and black.