I've used both (only used food colouring once, though) and I'm trying to figure out which is better. I thought food colouring would be cheaper, but it sure takes a lot to get enough colour on the yarn. I'm also not crazy about using so much vinegar (I have found that the kool aid is acidic enough to set the dye without using vinegar). On the other hand, I can't find as many different colours in kool aid, and I think it's easier to mix colours with the food dye. Anyone have any thoughts? I suppose I could just use both, whichever was better for a given situation. I have only been able to find the little teeny squeeze bottles that come four in a little cardboard box for the food colouring.








