Working with Brushes
When you launch combustion, the default Brushes palette appears. It includes both hard-edged round brushes and soft-edged airbrushes.
Hard-edged round brushes impart a constant outline and density to your painting strokes. In contrast, airbrushes are soft-edged and pressure sensitive: the longer you press on the mouse button, the denser the color.
To access the Brush controls: