Grow glow capsules-glow goo there is chemical bonding happening when you create gooey glowy goo.It is a mixture that contains two main types of chemical molecules suspended in water. The first type are chains of long plastic white glue molecules that drift around in the water.the second type are short,borax molecules that like to link up with the long chains.
There is also some zinc sulfide mixed in to provide the glow. The gooey glowy goo therefore has a network of interlinked molecules that trap water but is still semi-rigid enough to be pliable, rubbery and stretchy.