I dye hair! and I dye wool. I enjoy using the Jacquard dyes with about 2 tablespoons of vinegar to the gallon of water. The purpose of the vinegar is to open up the pores of the wool and let the dye go into the fibers. This works just like tenderizing meat, anything that is protein needs that bit of vinegar to help the fibers soak up the dye. When the water is clear the process is done; this is called exhausting the dye. The many different breeds of sheep give us our wool. Alpaca, llama, mohair goats, and rabbits, and others give us hair. I dye ewe wool, I dye loose fibers, I dye locks, I dye roving, I dye the spun yarn, I dye the silk hankies from the silk cocoon, I dye our clothes in the process, and I dye the your hair if you want. Sometimes I dye over a colored fleece and it makes a nice heathered effect. Different fibers; silk, hairs, wools, plant fibers, all take the dye in different shades or intensities. You can place the fleece or yarn into the water and have your dye mixed into your squeeze bottles, when you squirt the different colors on while in the pot and then the colors blend just a bit; getting a nice blended colorway. The more vinegar that you have in the pot the less your colors bleed. I enjoy using monotones to work with, different strenths and intensities makeup nicely.