I use a 100% all natural cotton muslin on the back of almost all my quilts.
I like this material because it’s an all natural product and has no synthetic fibers in it and the cotton for it is grown right here in the US. It comes to me in a natural color that I always describe as oatmeal colored because most of it is a cream, but then there is these little tiny speckles of dark (just like oatmeal).
It feels just like any cotton….until you wash it and then it turns into this buttery soft goodness that I love so much. I use it in all my quilts with the exception of minky dot quilts, but it is in the rag quilts where it really stands out the most I think.
On a rag quilt all the little edges poke out in every seem, so you can see the muslin on the front of the quilt and it rags beautifully. There is nothing like it. I’ve used regular cotton, broadcloth, even flannel, but nothing in my opinion is better than muslin.
I dye in very small batches, almost per quilt, so I never actually get the same color twice. There is always just a shade or two of difference.