How to grow natural-colored crystals? How to make instant crystals? How to make phosphorescent crystals that glow in the dark? 25 experiments to grow crystals of all shapes, sizes and colors. 9 crystal powders are provided to grow easily and safely. Experiences made using a microwave oven for speed and safety. Color illustration.
From 8 years old
37 x 7,3 x 31,8 cm