With the National Geographic: Secret Message Science Lab, kids will gain insight into pH science and learn fascinating facts about spy history.
- Two Decoder Wheels - Kids will get 3 decoder wheel missions, deciphering messages with a prefilled decoder wheel and creating their own decoder wheel/secret code language.
- Reveal a Secret Message - Using pH paper and a citric acid solution, kids will be able to reveal a secret message they've written with a colourless crayon.
- Hide a Secret Message - Using pH paper and a sodium bicarbonate solution, kids will be able to hide the secret message they've written with a colourless crayon.
