The Color Material Channel option determines the interaction between existing material channels and the vertex colors you assign. For all options other than None, lighting affects the object's shading. The Color Material Channel options are as follows:

None

None of the material properties of the shader(s) assigned to the object are used. In this case lighting is also disabled.

Ambient

The ambient material channel of the assigned shader(s) is overridden by the vertex color.

Ambient+Diffuse

The ambient and diffuse material channels of the assigned shader(s) are overridden by the vertex color.

Diffuse

The diffuse material channel of the assigned shader(s) is overridden by the vertex color. This is the default setting.

Specular

The specular material channel of the assigned shader(s) is overridden by the vertex color.

Emission

The emission material channel of the assigned shader(s) is overridden by the vertex color.