If using the premade liquid food coloring, add the coloring to the yogurt until you have the desired consistency. Thick Greek yogurt works best, but since we’re not adding a lot of liquid, it’s fine to use regular or unstrained yogurt for this option.
If using a dried powder, mix 1 tablespoon of powder with 1-2 tablespoons boiling water in a small bowl and stir to combine. Stir the water/powder mixture into ½ cup of yogurt. (For spirulina you’ll only need to use 1-2 teaspoons of powder.)
If using berries, beets, or fresh spinach, use the directions below.
Green Finger Paint (From Spinach)
Combine ½ cup tightly packed spinach and ¼ cup water in a blender. You can cut this recipe in half if your blender is smaller, but mine wouldn’t blend with any less than this. Blend until smooth.
Use about 3 tablespoons of the spinach water to color ½ cup of yogurt.
Purple or Pink Finger Paint (From Berries)
Cook ½ cup of berries over medium low heat, stirring constantly and mashing. I used frozen berries. You may need to add a few tablespoons water to prevent them from burning, but you don’t want excess liquid. Cook just until mushy and the color is released, about 3 minutes.
Strain the berries through a fine mesh sieve.
Add the resulting liquid to ½ cup yogurt.
Pink Finger Paint (From Beets)
Combine ½ cup roasted beet with ¼ cup of water in the blender. Blend until smooth, then strain.
You can also use the liquid from canned beets.
Add 3 tablespoons of the beet juice to ½ cup of yogurt.
I have not given an option for yellow finger paint, simply because it's usually made from turmeric which stains. I have used store-bought natural food dye (linked in recipe) and find the yellow can slightly stain some white dishes and clothing, but washes off of hands. Use of a smock recommended!