The bleeds are unset dyes. I agree with Feline Fanatic. Wash the quilt in hot water and Synthrapol until all the bleeds are gone. Synthrapol suspends unset dyes in water so the dye particles can be rinsed away. It can take more than one washing in Synthrapol. I would inspect the quilt before drying, and simply re-wash in Synthrapol and hot water as long as bleeds are obvious. This needs to be done in a machine that uses a *lot* of water; a large front-loader in a laundromat would be ideal.
Many quilt shops carry Synthrapol; call and ask. Here is a link to it on Amazon:
http://www.amazon.com/Craft-Synthrap...dp/B000YZ3UHQ/