Rheoscopic Fluid.

Demonstrate ocean currents, aerodynamics, turbulence, convection, erosion, and other movements of nature that are often difficult to see. Unlike dyes, this crystal suspension will last almost indefinitely. It rarely settles! Currents are beautifully demonstrated as the flat crystals align along shear planes, reflecting differing intensities of ambient light. It comes pearl-white in color, but the fluid can also be dyed with water-based food coloring if desired. Size: 1 litre.