One time when I had this issue, I used a black paintstik behind the quilt top's fabric (the underside) to "color it in" and heat set it. Washed it carefully prior to quilting to make sure all was well and proceeded with quilting and it worked out just fine. I couldn't use the black batting because there were areas of material in white that were thin and it would have showed through. So I got the idea of the "paintstik" and it worked wonders for me!
Explosive blessings, abundance and inspiration to you all!
- The Creative Seamstress