Meanwhile, pour 1-1/2 teaspoons of white vinegar or lemon juice into each canning jar.
Add 10 to 20 drops of gel food coloring to jars. Stir together food coloring and vinegar with a disposable wooden popsicle stick.
Care add one hard-boiled egg to each jar and quickly add enough boiling water to each jar to cover egg.
Soak the eggs in the dye for around five minutes.
Place the dyed eggs back in their carton, and allow them to dry completely. Dip paper towel into olive oil and rub over dyed eggs to give the eggs a shiny appearance. Keep refrigerated.