I wash all the fabric when it comes in the house. Last week I purchased black and red fabric to make sashing around two quilts with great blocks. I got the fabric at JoAnns and from the get go (from all the information from this wonderful Quilting Board) get it to the washer. I started with the red first. I always wash in warm water and threw in 5 color catchers and the catchers were all bright red. I rinsed it again with 5 more catchers and more red. Finally, threw it in dryer for 15 minutes and hung it up. Same thing with the black fabric and the same with the dryer. Now, when I give anyone a quilt anymore, I tell them to wash it in cold or warm water and use color catchers. That is the best I can do.