I just got the book about jelly rolls by Pam Lintott, and she says that the fabric shouldn't be washed and dried for obvious reasons. I now wonder what to do about fabric bleeding or transfer, especially if the blender is a white or cream?
My first jelly roll was a batik roll in blues, and I washed it a while ago and much of the colour came out, even though it was not cheap fabric and it came from a quilting shop.