Print on sturdy cardstock and laminate (best suited for thick lamination). Make available with 3 droplet bottles: one with yellow water, one with blue water and one with red water. You can use food coloring mixed with water but for the most vibrant colors, use liquid watercolors. Place one droplet of each color on the colored dots, mix inside each circle using a toothpick. Using a sheet of a white paper towel, lay it over the wheel. I like to use a 1 minute sand timer to offer a little time for the paper towel to soak up the dye.