Originally Posted by MadQuilter
Flannel and cotton shrink at a different rate - the flannels much more than the cotton. Minkey almost looks like a knit, which would not ravel well at all.
Personally, I would stick to the flannel for the rag quilt OR the cotton. The amount and look of ravel will be different for each and I think it might look messy.
I usually use flannel on one side and cotton on the other.