Gelli Play Foil Bags let you turn water into thick colourful goo and back again. It's a totally unique, fun product that allows children to get creative. All that is needed is a bowl of water, sprinkle the sachet of Gelli powder and that's it! Watch your water magically turn into Gelli play and have endless amounts of fun. By adding more water to the goo, it will turn back into coloured water that can be drained away safely and easily so there's no hassle and no mess. Gelli play is available in red and green (random colour chosen) and is 100% safe.