It’s also important to use a high-quality paper that can handle the water and won’t buckle or warp. There are many great brands of watercolor brush pens on the market, each with their own ...

Now imagine that instead of ink, you are squeezing out toothpaste, and instead of a pen, you have a toothbrush. Finally, swap the metal for plastic and you have Kawamura Ganjavian's Twist&Brush ...