These putties are not your average moulding material. Oh, sure, they sculpt & stick & squish & mould & mush with the best of ‘em, but these fellas hold a secret. Under the right circumstances – circumstances involving exposure to UV light – these putties change… colour. The UV ‘ Hyper-Reactive’ putties come in either a sickly green or a gooey white, & each tin comes with a small UV light. When you shine this UV light on the UV-reactive putties… well, there’s a reason they’re called ‘hyper-reactive’. Whichever of these putties you choose, they all make for amazing gooey sculpting materials, letting you mould, make & mush whatever you want with them. Don’t miss out! Peace of mind: All our putties & slime products have been tested to the highest safety standards & are fully compliant with EU Toy safety levels.