Oh no!! I am working on a quilt called "Harvest" and am using the "Green Tea" batiks. I never gave a thought to these bleeding! I am almost finished with the blocks, so it's too late to prewash now. They are set with white on white fabric. Would you gals advise washing with Retayne or washing and putting a color catcher in when I've completed the quilt. Sure glad I read this thread, because I have been buying lots of batiks for my stash, and I am not a prewasher of fabric. I sure will be now with batiks!!