This is really cool! It will amaze your kids and teach them some science all at once. Time needed: 4-7 days
Put an egg in a cup and fill it with apple cider vinegar till egg is covered. Cover tightly and let it sit. Each day give it a swirl. At the end you rinse off the egg and VIOLA! A rubber egg! Just be careful…it will bounce but is still delicate and very smelly when it breaks. LOL …Not rotten — just smells like vinegar. Always keep it in the fridge during the whole process!
Added tip: If you place the “naked egg” in corn syrup, it will shrink/shrivel up. The vinegar inside the egg moves through the semi-permeable membrane.
You can then place it in water with food coloring and “color” the inside of the egg and it will fill up again due to osmosis
Clean a mason jar and dry – then wipe with a clean cloth and rubbing alcohol. This is important for the preparation of the glass to make it accept the paint. Use star stickers (or any shape stickers) and apply to mason jar in a design or random. Try not to touch the glass with your fingers anymore then absolutely necessary, the oil from your fingers can make it so the paint won’t stick. Paint with a variety of colors as an all over design or put cap on mason jar and dip one end in one color paint and dry – then dip the other in paint and dry. If you paint the bottom first and then the top and dry with the mason jar right side up the top paint can drip in streaks over paint on the bottom. It is best to use acrylic paint but you will need to seal this with polyurethane so a design painted by a child with finger paints would work as well – and would make a nice gift for a parent or grandparent.