Place eggs in a heavy-bottomed saucepan and cover them with cold water. Make sure the tops of the eggs are covered by at least an inch of water. How much water will depend on the size of the pot, but in general, a bigger pot is better. Crowding the eggs risks cracking them.
Bring the water to a full boil, uncovered, then remove the pot from the heat and cover it. Let the pot stand untouched for 17 minutes.
Remove the boiled eggs from the water and transfer them to a bowl of cold water for 15 minutes. They are ready to decorate.
Start the eggs in cold water, when the water comes to a boil, shut off the burner and let them set for a few minutes. When almost cool, drain eggs. When ready to color ,add a little white vinegar to each diluted color cup.This keeps the color on the egg.