Even "good" fabric can bleed. I prewash everything with color catchers. Acidity in the water, differing chemicals in the detergents, etc can make it risky not to. Several years ago I washed some older Hoffman fabric and the red lettering bled just enough to make the words blurry around the edges. Very disappointing! I've also seen the creepy things that live in warehouses, and with the formaldehyde in fabrics-it just makes sense for me. I haven't bought jelly rolls, but I've been Soooo tempted! I did just buy a Moda Summer Breeze Layer Cake- debating if I'll wash it before or after sewing.