National Geographic Secret Message Science Lab Science Kit

A hands-on STEM activity kit that teaches children about invisible ink, secret codes, and the science of cryptography through fun experiments. Suits ages 8+ years.

Includes: 
- 2 decoder wheels
- Spy badge
- Invisible ink crayon
- Spray bottle
- 4 pH test strips
- 2 sponges
- Sodium bicarbonate (16g)
- Citric acid (25g)
- 5 learning and activity cards

Size: 25.4 × 18.5 × 6.2cm

Safety: Adult supervision recommended. Contains chemicals that may be harmful if misused. Always read and follow the safety instructions provided.