The Pentel Pocket Brush Pen has a fanatical following among artists. It has a springy, responsive brush that can do hairlines and fat strokes. The ink is waterproof black, and comes in cartridges. Pentel also makes Pentel Aquash, the waterbrush that made watercolor painting urban-friendly. Waterbrushes hold water in the barrel so artists on the go don’t court spilling disasters. The Pentel Aquash comes on its own, or as part of a portable watercolor set.
When you put the two together, you get the Pentel Aquash Watercolor Brush.
![Pentel Aquash watercolor brush Pentel Aquash watercolor brush](http://www.leighreyes.com/wp-content/uploads/2011/04/P1010362-600x800.jpg)
The barrel is the cartridge. The ink is light black, and waterproof. It reminds me of diluted sumi ink, especially when applied in layers.
![Pentel family shot Pentel family shot](http://www.leighreyes.com/wp-content/uploads/2011/04/P1010363-600x800.jpg)
The Pocket Brush pen and the Aquash have very different brush tips. The Aquash has a fuller base, and overall is larger.
![Pentel Pocket Brush pen and Aquash Watercolor brush Pentel Pocket Brush pen and Aquash Watercolor brush](http://www.leighreyes.com/wp-content/uploads/2011/04/P1010380-600x450.jpg)
The Pocket brush feels like it has thicker ink. The Aquash with Light Black pigment ink feels more watery.
![Comparison Comparison](http://www.leighreyes.com/wp-content/uploads/2011/04/P1010368-600x800.jpg)
Here’s how it looks bare, then with watercolor added.
!["Why isn't he DM'ing me yet?" "Why isn't he DM'ing me yet?"](http://www.leighreyes.com/wp-content/uploads/2011/04/P1010369-600x800.jpg)
!["Oh, he's not on Twitter." "Oh, he's not on Twitter."](http://www.leighreyes.com/wp-content/uploads/2011/04/P1010372-600x450.jpg)
I really like the change from strong black outlines. I used a Pentel Aquash waterbrush to apply the watercolor. Because they’re the same body shape, my hand wasn’t jarred from its rhythm, the way it usually feels when I switch between – let’s say – the Pocket Brush pen and a regular watercolor brush with a thin handle.