Pentel Aquash Watercolor Brush Pen Refill - Pigment Ink - Light Black

This brush is more a light black color rather than a gray because the color is slightly transparent. That is, it's not a black color mixed with white to create gray, but rather a more diluted black color. Take a close look at the following picture to see how the black color of the Pentel Standard Brush pen shows up against the Pentel Aquash Watercolor Brush.

The body of the Pentel Aquash Watercolor brush is also shorter and more ergonomically shaped than the Pentel Standard brush line. With the cap on, this brush measures 15.5 cm (6.10 inches) while the Pentel Standard brush measures 17.5 cm (6.89 inches) with the cap on.