I'm not sure why you would pre-wash in HOT water. I would NEVER wash a quilt in HOT so I see no reason to pre-wash in HOT. It's just asking for trouble. I do test some fabrics - reds, batiks - a small piece in a white bowl w/hot tap water. If it bleeds I will pre-wash in WARM water w/a color catcher in the machine. I have had very few fabrics bleed at all including batiks.
One question on this as well - I wonder if bleeding has to do w/what type of water you have - hard- soft - well water? Just wondering... Regardless of the type of water you can pretty much guarantee shrinkage w/HOT water and 100% cotton fabrics!