Made from hydrophilic ('water loving') polymer, these tiny gel-like cubes will expand dramatically when dropped in water. After a few hours you will have large gel-like cubes that are invisible in water.  Or add food colouring to the water to produce coloured cubes. Leave them out on the shelve and they become small cubes again. Can be expanded many times into the irresistible, slippery giant jelly cubes.

Size: We have expanded a 5 mm cube into a 30 mm cube. That's a 215 times increase in volume!

Included: 20 g (approx. 100 cubes) See instructions & classroom tips under 'Downloads' on this website.

Teach: super absorbent polymers, hydrophilic substances, gels, optical density, osmosis

Safety: Made from non-toxic super absorbent material, these spheres can't expand in the stomach's acidic environment but due to the small size are NOT classified AS TOYS. We recommend adult supervision.

Age: 6+ with adult supervision. 

See our Expanding Spheres too.