Gently place eggs in single layer in large saucepan. Add enough cold water to cover eggs by 1 inch. Cover. Bring just to boil on high heat. Remove from heat. Let stand 12 minutes. (Adjust time up or down by 3 minutes for each size larger or smaller).
Pour off hot water and rapidly cool eggs by running them under cold water (or place in ice water) until completely cooled.
Mix 1/2 teaspoon vinegar and drops of food color in a small container to achieve desired color. Repeat for each color. Paint hard-cooked eggs with small paintbrush or cotton swabs. Allow eggs to dry.
• Line work surface with layers of newspaper before dyeing eggs.
• Gather all equipment including small bowls or cups for each food color, spoons for each bowl and paper towels for spills. Bowls should be deep enough to completely submerge the egg.
• For easy clean-up, use soap and water repeatedly to remove food color from hands and most kitchen countertops. If needed, use all-purpose cleaner with bleach for countertops.
• Make an egg drying stand out of a paper towel tube cut into sections.