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Steve Spangler Science Vampire String Slime features a special dye that turns from eerie green to blood red when you put it up to the light. It reacts differently to both regular and ultraviolet light, so it’s a fun science experiment kit for kids that’s hands-on and exciting! Introduce the concepts of chemical bonding, cross-linking of molecules and the properties of polymers. Plus, a battery-powered black light is included, so the fun can start right away! To make Steve Spangler's Color-Changing String Slime, squirt the slime into the bowl of Activator solution. The instant the two liquids touch, you get solid String Slime. With all slime supplies included, it’s easy to create! What makes Steve Spangler’s slime formulation unlike anything else on the market is the addition of stabilizing agents that help to reduce the growth of bacteria while preserving the stretchy, stringy, gooey properties of slime. It’s the ideal slime kit to bring the excitement of science and STEM learning into your home or classroom.