National Geographic Glow-in-the-Dark Crystal Lab is an easy and fun way to grow a crystal at home that glows in the dark! Simply mix the crystal-growing powder in water, add your seed rock, and in just a few days you'll have an amazing crystal! Easy-to-follow instructions and a full-colour learning guide are also included.

Seed rock is the glow-in-the-dark element, the crystal itself is white.

8 years.