Place one tablespoon of oil and one tablespoon of vinegar into each mug. Add a different color of food coloring to each mug. Fill to 3/4 full with water and stir each one. Each mug should have its own spoon.
Hold your boiled egg in one hand and stir the liquid in the mug with the spoon using your other hand. Stir it several times to create a whirlpool effect. Immediately remove the spoon, place egg on spoon and lower egg into swirling water.
Count to 5 or 6 and remove the egg.
Place it on a paper towel, but don’t pat it dry. Let each color rest for several minutes, the color may get a bit darker as they rest. Repeat the above for a second color on each, or leave as single colors. Again, let them rest for several minutes. When you are happy with the results, gently wipe the eggs off with paper towel.