Add the water and blackberries to pot and let simmer for about 5 minutes before smashing the blackberries.
Stir and let simmer for another 5 minutes.
Strain the mixture and add the vinegar to the remaining liquid.
Add the eggs to the liquid and let them set in the dye until they reach the color you desire. I left them in the dye for about 8 hours in the refrigerator.
Remove the foam from the top of the dye and gently remove the eggs from the bowl. Place them on paper towels to dry, flipping after a few minutes for the other side to finish drying.