Setting dye in cotton?

[indeliblesasha]

I am working on a baby blanket in a cotton worsted that I know bleeds (I stopped using it for rags because it just turns everything blue,) and since it's going to get washed a lot I would like to prevent it from bleeding into the yellow I'm striping it with, and fading.

I was thinking a nice long soak in vinegar and then microwaving it a bit like I do with my wools I'm dying. Will that work with cotton that's already been dyed, do you think?

If you have any other suggestions I'd be glad for them :) Thanks everyone. ♥