Captivate your students with this unique fluid. Its suspended pearly crystals show current movement continually, without settling out. This non-toxic, pearly white substance is a water-based suspension. When warmed or cooled, strong convection currents appear. Appropriate for all grade levels K – College. Rheoscopic Fluid comes white and can easily be colored with just a few drops of ordinary food coloring. 32 oz container (~1 liter) Activity guide included.