I agree with the comment about the color catchers.
I love them and they are worth every penny. We get them for about 4 bucks a box or so. I've made two samplers with very rich greens and purples. The green blender for the backing particularly bled. It was prewashed and pressed. But as I quilted it, it was turning my fingertips green. I washed with color catchers and the white is WHITE and all the light colors retained their pretty hues too. I think anyone who makes quilts or clothes should use them. Also handy in a state like Nebraska as we wear Red to support our football team on the weekends. Keeps the red red and the white white. LOVE THEM!