Gather materials. You will need bowl, a highlightter, 2 jars ,1 or 2eggs, vinegar, water, and a black light.
Take the inside part of the highlighter , the part that holds the color, out. Put it in a bowl.
Pour at least a cup of vinager in the same bowl.
We did this with a yellow and blue highilghter.
Place the egg in the jar. Pour the vinegar/highlighter mix into the jar. It should cover the egg.
Let the eggs sit for at least two days. They shoud be larger and squishy if not let them sit for longer. Ours sat for a week.
Take the eggs out and rise them in water, place them in front of a black light to glow. They will also be bouncy!