National Geographic Secret Message Science Lab

About this toy

Become a secret agent with this spy science kit. Write hidden notes with the colourless crayon, decode messages with the decoder wheels and use pH paper and simple ingredients for a fizzy reaction. Clear instructions and a learning guide explain how the tricks work.

• Decoder wheels and a spy badge
• Colourless crayon, pH paper, sponges and a spray bottle
• Sodium bicarbonate and citric acid included
• Clear instructions and a learning guide
• Suitable for ages 8 and up

In the box: 2 decoder wheels, 1 spy badge, 1 colourless crayon, 1 sodium bicarbonate, 1 citric acid, 4 pH papers, 2 sponges and 1 spray bottle.