Someone asked that I detail the process for anyone who was interested in doing this at home, so here you go, Susie!
1 quart jar
2-4 packets of KoolAid in colors you like
undyed yarn (I used 1/2 of this: http://www.knitpicks.com/Bare+Peruvian+Highland+Wool+Yarn_YD5420101.html for each of my students)
1. Wind your yarn into a very loose skein and soak in warm water for at least 30 minutes. This step makes sure all the yarn fibers are saturated and better able to accept the dye.
2. In the quart jar, mix the KoolAid powder with 1/4 c white vinegar and then fill the jar to the half way mark with warm water.
3. Put the sopping wet yarn into the jar. If you want a more even dye, make sure the yarn does not get smooshed up against itself or the jar. You may want to use a larger jar. I happen to like the variations I get when the dye can’t quite get to every spot equally.
4. Fill the jar to the very top with more warm water if necessary (all the yarn should be covered), and put the lid on tight! Place your jar in a sunny spot.
5. Check your jar after a few hours. When the water inside the jar is clear, the dyeing is done. Be sure to check the bottom of the jar, as the dye will sink to the bottom. The top water will be clear before the water at the bottom. It’s ok to shake the jar periodically if you like. Again, I really like the variations, so I keep the shaking to a minimum. Some dyes take longer than others to “take” and the warmth of your weather will have an effect, too. It’s okay to let the yarn sit for a couple days.
6. Once the dye has been absorbed, carefully remove the yarn from the jar and rinse it very gently in cold water. This will remove any remaining dye and most of the vinegar smell. Hang it up to dry.
7. Once your yarn is completely dry, it can be wound into skeins or balls, ready to knit, crochet, or felt!