I love the look of black but some blacks tend to fade just with time.
But I want to share with all of you that recently I purchased a piece of "craft" fabric that I was reasonably certain was going to bleed. It was only a yard so was easy to handle. Not only did it bleed, it "hemorrhaged". I washed it by hand several times and the bleeding continued. I knew I couldn't use it for anything that way so explored the internet. There was suggestion of using white vinegar--that didn't work. But I resorted to table salt. I use a Folgers "can" for various chores around the house so that was the size that the yard of fabric would fit into. Added a handful of plain table salt to the water and let it soak. It worked!! The color seems to be set and the piece of fabric is beautiful. Give it a try to see if it will work for you, too!