Although the recipe is for mohair, I have found Kool Aid useful for dyeing most animal fiber yarns. It is especially effective if you overdye several different leftover colors. The result is a set of related colors that are easy to use together. Thanks to Wheat Carr. Kool Aid Info Mohair possitively inhales and reverberates with whatever color you use.
Wool can be very nice, but slightly less intense.
Although it does work, I have not been pleased with the results when I used already spun yarns, either my own or some commercially done. More KA if darker color preferred. Dissolve 1 package of Kool Aid into 1.5 quarts of water. Add presoaked fiber. Microwave on high for approximately 6 minutes or until all color has been absorbed and the water is clear.