Vertex Paint Tools
Paints a specified color over the object.
Smooths out the colors of adjacent vertices. In this mode the Color Value is ignored. The strength defines how much the colors are blurred.
Smooths color by painting the average resulting color from all colors under the brush.
Smudges colors by grabbing the colors under the brush and "dragging" them. This can be imagined as a finger painting tool.
Change the color only to the stroke points that already have a color applied.