I prewash everything, and have done much hand prewashing, and I can tell you I have had every color under the rainbow bleed when I was handwashing in hot water in a white sink where the color loss was evident. I am not referring only to batiks, but to all cotton fabrics, both quilt store quality and lesser expensive cottons. Yellow, pink, every color out there has bled for me at one time or another. You just never can tell what will bleed and what won't bleed.