Just add water and capture a wave in a test tube! Discover how colors and densities collide in a single giant test tube. Mix the three primary colors into any number of color combos; watch three different densities compete for space, and create a hand-held "lava wave." It's the fun side of scientific blobs! Comes with everything you need to make erupting, bubbling potion in a test tube! Includes 3 cool activities inside. Ages 8+.