I have used black batting on two quilts where the background fabric was black. On one all the other fabrics were batiks and on the other it was a mix of batiks and regular printed quilting cottons.
On one, (
http://www.quiltingboard.com/picture...l-t270708.html ) I got some shadowing through the lightest yellow batik in the center star. On the other, (
http://www.quiltingboard.com/picture...p-t127559.html )
which I hand quilted, I got no shadowing on the lighter colors. Not sure if it was because of the less dense hand quilting or not because it is the same yellow batik fabric in both.
In the future, I will only use black batting in a predominantly dark quilt. If it has any light colors at all, I will not use it unless I line the light fabrics.