Hard-boil the eggs and let them cool
Gather food coloring, cups, water, and vinegar
Fill each cup with 1/2 cup hot water
Add 1 teaspoon vinegar to each cup
Add 10 to 20 drops of food coloring to each cup
Stir the dye mixture well
Place one egg in each cup
Let the eggs soak until the color is desired
Remove the eggs with a spoon
Place the eggs on paper towels to dry
Repeat with different colors if desired