Edit
Specular
This setting adjusts the color of the highlights and how it reacts
to lights.

Using:
- Under
the Edit Texure menu (Paint/Edit) click the Specular radio button.
- Choose
the desired color from the color dialog. Adjust the color if
desired using the R(red), G(green) and B(blue) sliders.
The 3D sampler updates in instantly the effect of the slider.