Many food dye fanatics flirt with Kool-Aid and then succumb to Wilton.
Wilton has dozen of pre-made shades. You can mix them together. Or mix them with Kool-Aid, Klass, McCormick or any other artificial food color brand.
Designed to make cake frosting, the premixed colors come in 1 oz and 1/2 oz screw top containers.
Unlike Kool-Aid (which contains citric acid), Wilton will not bind to wool by itself. You will need to add white vinegar, lemon juice or citric acid during the dyeing process.
Wilton is perfectly safe for children to use, and won't contaminate measuring spoons and mixing bowls (so you can use them for food preparation later).
As Wilton also contains sugars and glycerine, rinse your fiber well after dyeing.
Wilton comes in a gel. A little goes along way. I use a 1/16 teaspoon for .2 oz of Lion Brand Fishermen wool yarn.
12 Icing Colors - Lemon, Golden, Pink, "No-Taste" Red, Burgundy, Violet, Royal, Teal, Kelly, Copper, Brown, and Black
Disney Fairies Icing Color set - Skin Tone, Blue, Red, and Yellow
See how to make mini hanks, for testing dye formulas and making small projects.
By altering the amount of Wilton gel and other food colors, you can make pastels.
See AmeriColor color charts with formulas
Short bits that aren't full pages on Dye Your Yarn.