The hotter, the brighterCrazy Aaron’s Heat Sensitive Hypercolor Putties respond to heat and cold! In your hand, under a heat lamp, or around your coffee mug, watch vivid orange and green lighten up to brilliant yellows and deep purples burst into hot pink or baby blue. Available in Twilight, Sunburst, Chameleon, and Amethyst Blush designs. Includes putty and 4” tin container. Ages 3 and up.