Tried the Ice Blue Lemonade Kool-Aid, and discovered that you get a nice light blue, but it still wasn't as dark as I wanted. Sigh. OK, back to the drawing board, or dye pot. While I was waiting for the first skein of Romney to dry so I could check the color, I finished spinning and plying the rest of the Romney, so I have about 6 ounces (approximately 255 yards) of finished yarn.
The second try was with Blue Berry Kool-Aid: 6 packets of Blue Berry and 2 packets of Ice Blue Lemonade, along with 1 1/2 cups of vinegar and enough water to cover the balls of yarn. This time I gave the dye pots (my stainless steel saucepans) 90 minutes in the oven at 210 degrees and then let them cool in the liquor overnight before rinsing. This time, I got a much "bluer" blue, and the red from the Cherry Kool-Aid is more subdued than in the yarn dyed with the Ice Blue Lemonade Kool-Aid. The yarn is a variegated blue through a process known as "cloud dyeing": you roll the undyed yarn into a ball (I use a ball winder), then dye it rolled up. The dye doesn't penetrate completely, and you get these lovely clouded patterns in the finished yarn.
The other skeins are some other yarns dyed with Orange and Grape Kool-Aid. I have all this yarn I've spun, but never done anything with, so I'm trying to get rid of some of it by dyeing it up bright colors. Perhaps the fact that it's dyed will motivate me to do something with it.