Only mad scientists need apply! Perfect for budding little Edisons & future Teslas who have taken an interest in all the weird & wonderful science goings on. This wonderful little experiment lets them create their gooey putty that once poked & prodded produces a hilarious fart sound. All they need to do is mix the strange chemical compound with water, give it a good stir & hey presto, after a few minutes an amazing & gooey putty has been created. Pushing their fingers into the putty expels the air & this creates all manner of disgusting trumping & fart sounds! Great for kids with scientific minds. Comes with two putty colours, neon yellow & pink.