Those tangled edges mean one of two things... either it really cheap fabric or the cut was not perpendicular to the selvage.
I prewash everything in HOT water, dry it, then starch and cut. The one time something is going to bleed is the one time you really need for it not to. PITB to iron all that fabric? Sure... pain of having 200 hours into a quilt with darks bleeding into lights? Forever.
tim in san jose