Captivate students with this unique liquid. Demonstrate ocean currents, aerodynamics, turbulence, convection, erosion, and other movements of nature that are difficult to see. This pearly-white, water-based suspension can be coloured with a few drops of food colouring to make it even more effective. This non-toxic pearly white substance is a water based suspension. When warmed or cooled strong convection current appear. Activity guide included.