Yes! You can dye your natural fibers, including wool, cotton, mohair, alpaca, llama, etc. with Kool Aid. It is simple, inexpensive, and effective. I have used them in a pinch when I have run short of commercial acid dye. Kool Aid stains fiber or fabric, so it will work as a dye. Kids love this project! The only thing to remember is that for a rich vibrant color, you must use a lot of Kool Aid for a small amount of fiber. Heat the Kool Aid in water and vinegar just as you would an acid dye, and let it simmer on the stove. Or as an alternative, add ingredients in a microwave safe bowl and microwave for several minutes. I have a friend who puts the solution with 2 ounces of fiber in a quart canning jar and leaves it in the sun for several hours. Anything that will apply heat to the mixture will work. Just simply rinse when done and air dry.