Hi - sorry about your bleeding problem! Anytime I use a cheaper, very bright color, I wash the fabric before I use it. I have been burned by this before. Colors especially prone to bleed are reds, purples and black. If you have to wash it in warm/hot water more than 2 times, don't use it!! I've tried washing with salt in the water without any luck. Haven't tried vinegar. There are two commercial products -- synthrapol and retayne. I especially like the second one. They are good when you haven't pre-washed fabric and would like to set the colors to be sure they don't bleed. Add the proper amounts to the wash load - use HOT water and let sit for the recommended time in the wash. Continue the wash cycle to the end, then dry immediately. Do not let the quilt sit wet for a long time. Good luck!
Terri