You are truly a good man to be so helpful so often.
1. There are lights in the scene, and they are on the brush from the beginning.
2. I tried turning off REAL lights, but no change.
3. I'm not using a textured brush, so the Color1 option is greyede out and not available to me. I did try chaning the colors under regular shading to have lots of luminance, but again no change.
Any other thoughts?
Thanks for the effort.