Introduce your child to this spooky science project for Halloween — or any time of the year! Dehydration is an ancient method for preserving everything from food to mummies. Using salt and baking soda, your child can carve and dehydrate (dry out) an apple to create mummified fruit.
Salt is a desiccant, which is another word for a chemical that’s good at pulling water out of other things. Not only does it speed drying, it kills any microbes that might cause the apple to spoil.
What You’ll Need