Here's another for what it's worth. My first large quilt (queen size) had red borders. I tested the fabric in just a glass of hot water, letting it sit for a while, then put in a piece of all-white paper towel. If the fabric bled (which this one did), I used a dye fixative, which I purchased from Rit Dye. You probably won't find it in any store -- I didn't. Had to order it off their website. They ship it Federal Express Ground. I just ordered three more bottles, and the shipping and product cost about $22. I don't have any ownership or interest in Rit Dye -- it's just a product I use. At any rate, after I used the product, I tested the fabric again. The all-white paper towel stayed all white!
Just a "for what it's worth".
Jeanette Frantz