Slime is a Non-Newtonian fluid which means that its viscosity can change. When the students pull it apart abruptly it will break but pulled slowly it will stretch." (taken from "The Science Behind Slime"by Dana Abraham 2014
Everyone took a bag home. Should you need to dissolve it, vinegar will work. Students added color if the chose, glitter if they wanted. It was a fabulous day of scientific discovery and artistic creation.