I just finished spinning and dying a few ounces of yarn for the first time. I even made the drop spindle myself, with a dowel and a circle-cut saw, because those things are always fucking overpriced. They dye, though, was all Kool Aid (Cherry with undertones of grape). Wanna know something creepy? When you put a big bundle of wool in a pot full of super-concentrated hot Kool Aid, it soaks up all the dye. As in, I put mess of white yarn in a pot of opaque-red Kool Aid, turned on the stove, and pulled pomegranate red yarn out of crystal clear water. I tried rinsing it just to be on the safe side, so it wouldn’t bleed or stain later, but nothing came out.
I am, however, quite pleased with the end result. I hung up the skeins to dry in the shower, weighted down with cans of curry and vegetarian Abalone-substitute (which, FYI, is incredibly fucking tasty. I have no idea if actual abalones are anywhere near this good, but holy crap is the cheap, canned gluten based fake stuff delicious)
ETA: Here’s the comprehensive how-to I used for the dying, courtesy of Knitty.