[QUOTE=Lisa_wanna_b_quilter;5507152]You will get dozens of responses on this. Quilters are divided. Many prewash everything and won't go near a piece of fabric that has not been washed. Others wash nothing. One thing they all seem to agree on is washing batiks because they nearly always bleed. Most agree that prewashing flannel is required because it typically shrinks so much. (Unless it will be a rag quilt and then most don't wash it.)
I'm one that prewashes everything, yes even fat quarters, charms,and jelly rolls,recieved as gifts, (use sweater bags for small pieces and jelly rolls,) I always wash and dry new fabric the same way I will the finished quilt and I always use color catchers. All it takes is one runing color or one fabric that shrinks a lot more than the rest and all your hard work is ruined. I have noticed a lot less shrinkage and running colors in the last few years, maybe the fabric makers are improving there products. Do what you feel best in any given case.