Multi-Colored Swell Polymers Spheres

It might be what rainbows feel like
Perhaps a little like unicorn tears
Some say it is kinda like Leprechaun tears
Often mistaken as ectoplasm

These curious growing spheres are made from a super absorbent polymer (or SAP) chemical. SAPs are amazing materials. They are long chains of molecules that join together in a net-like pattern. Water is pulled in through the holes of the net. Then, the molecule chains soak up tremendous amounts of water. When the molecules absorb water, they swell, soften, and transform into a hydrogel.

Swell!