Ouch! that certainly is not fun to have happen. If you have not dried the quilt in the dryer, you may be able to soak the quilt in either Synthrapol or Dawn dishwashing liquid, in warm water. that often will remove staining from batiks. There was something on the TQS forum a while ago about it, also an article on a quilter's blog, if you google Dawn dishwashing liquid and fabric staining or bleeding, you will probably find it. I've had it happen and mostly I was able to get the bleeding out. Only once, when I had used my own hand dyed turquoise fabric, did it not come out. My own fault for not getting all the loose dye out to begin with! Hope you can find the article. (If you did dry the quilt in the dryer, it reduces the chances of getting the staining out- ask me how I know that
) Kathy