Talens Ecoline Brush Pen Cold Grey Light 738 is based on dyes and Gum arabic. The colours of Talens Ecoline are astonishingly bright and brilliant. If you wish, you can easily decrease the colour intensity through thinning with water or with the Brush Pen blender. Store the original works of art in a portfolio for optimal colour retention.The concentrated formula of the Talens Ecoline in the Brush Pens ensures for a seamless transition with the Talens Ecoline from the bottles. Using the special Brush Pen blender, colours can be mixed or subdued, and some wonderful wash effects and colour transitions can be created. Forgotten to put the cap back on? A dried brush tip can be easily saved by moistering it with some water.