Rainbow "Rubber" Eggs
- Distilled white vinegar
- Glass cups or jars
- Food coloring
Pour the vinegar into the glass containers, fill about halfway. Stir in a few drops of food coloring.
Place the eggs in the vinegar and food coloring mixture for 48 hours.
After 48 hours the top of the liquid should have a "scummy" appearance. This lets you know that the eggs are ready.
Rinse your eggs off really well. They will most likely still transfer some food coloring to fingers, so handle carefully or with gloves.
Feel the eggs, they should feel springy and have an elastic quality to them.
In a bowl or in the sink, carefully puncture the outside of the egg.
What do you notice about the egg? Do the insides feel rubbery too or not? What happened to change the egg?
The vinegar has dissolved the shell but left the membrane intact creating the rubbery feel. The membrane doesn't dissolve and holds in the egg's contents. Vinegar is an acid and has dissolved the shell.
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