How can you dye eggs to get these gorgeous blue shades? TwineAndTable blog shared a wonderful idea! Prepare hard-boiled eggs, 4 cups red cabbage, 2 tbsp vinegar. Shred or chop red cabbage. Place 4 cups of cabbage into a large pot with 1 quart of water and 2 tbsp white vinegar. Bring to a boil, then lower heat. Simmer for 30 min-1 hr. Strain dye into a bowl. Experiment with leaving the eggs in your dye for different lengths of time to create varying shades of blue. Light blue – soak in room temperature cabbage dye for around 30 minutes to an hour. Royal blue – soak in room temperature cabbage dye overnight. Enjoy!