My grandma always dyed eggs with onion peels--that's how they did it back in the day! We made some last year but struggled with keeping the onion peel on the egg. This looks like an easier alternative.
Easter egg color chart -Mix cup boiling water, 1 teaspoon vinegar and 10 to 20 drops food color in a cup to achieve desired colors. Repeat for each color. Dip hard-cooked eggs in dye for about 5 minutes