Hard boil your eggs using your favorite method. Mine is in the Instant Pot, it makes them much easier to peel.
Let the eggs cool to the touch and peel them.
For the light blue eggs, combine water and butterfly pea flowers in a sealable plastic container. The water will become more vivid the longer they soak, so don’t worry if it looks pale for now.
For the deep purple eggs, combine the water, vinegar, and butterfly pea flowers in a sealable plastic container. The water will become more vivid the longer they soak, so don’t worry if it looks pale for now.
Once peeled, add the eggs to the water mixture and seal with the lid. Put in the fridge overnight at least, up to 24 hours.
Remove the eggs from the water, lightly rinse off any flower pieces, and prepare your deviled eggs to your preferred methods.