
What are, "Treasure Rocks", you ask? Well, you take a little toy, mix some baking soda and water to make a clay/paste which you wrap around the small toy. Let dry overnight and hide outside. When your grandchildren find them, they can spray vinegar on them to watch the "rock" dissolve - in a very fizzy and fun way - to show the toy inside!
Sounds like great fun to me! What do you think?
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