I did that. I’ve done three hand washings, a trip in the washing machine, another hand washing, vinegar soak with two microwave zaps, and another rise. And now, as the sock is drying, it’s staining what it’s drying on.
ETA: I just washed the blue socks I’d done in the same pattern, and they bleed terribly, too! Sheesh loueesh!!! Why do people have sock yarn that does this? People wear socks on their feet!.. I put it in the washing machine and then tried a handwash to see if the dye would come out, and it did terribly! This is just really frustrating because I wanted to give people really nice gifts, and they’re turning out crap! Seriously, I’m considering just using the cheaper, not beautifully dyed yarns. At least they won’t ruin everything!!! Errrrr.
ETA further: But at least the vinegar worked on the blue Fleece Artist.