||Watercolor is one of the most appealing paint media enjoyed by artists around the world. Due to its complex nature, it is also one of hardest media to simulate on a computer for interactive painting applications. In this paper, we describe an extension of our previous work, MoXi, which is a system for simulating Chinese ink painting, to cover watercolor effects. These effects include backrun, granulation, and edge-darkening. A simple technique for quick post-simulation edge-darkening is also developed. We also discuss the use of the Kubulka-Munk Model for watercolor glazing composition.