Dinosaur Colour Changing Mug SetWatch as the dark Green vegetation fades away when hot liquid is added to reveal even more Dinosaurs and details of the hidden prehistoric scene. The perfect gift for children & families to share with siblings or friends. Just add hot liquid inside the mug and watch the outer design change color and reveal fun designs, characters and colors. Each gift box features 2 kid sized mugs with slightly different designs while sharing the same theme. 70 g (2.