Coloring Easter eggs naturally is child's play: This is how it works without any chemicals. The dyeing process is based on a broth in which the eggs are then cooked.
For yellow eggs, add 3 to 4 teaspoons of turmeric to a liter of water and let the broth boil for 30 minutes. To save resources, you can use coffee grounds instead of powder. If you want particularly intense colors, leave the eggs in the dye bath for several hours or overnight. According to Planet Wissen, a pinch of alum helps the color to be accepted.