Have yet to have this problem, but I agree that donating problem fabric isn't very kind. It's like the people who donate dented cans to the Food Pantry. I got one of those once when I fell on hard times. I got botulism from it. Now that I'm the one who gets to bless others, I make sure that what I'm giving is truly a blessing, not food poisoning ... or in the case of problem fabric, not something that is going to ruin someone's clothes.
If I really loved, loved, loved the fabric, I would wash it once with Synthropol & then set the remaining dye with Retayne. Then, to be sure the dye was finally & truly set, I would wash it again with a Color Catcher. But it would have to be awfully special to go through that much effort.