4 oz of rheoscopic fluid to visualize currents and the movement of liquids.This Pearl Swirl Rheoscopic Fluid will take almost any liquid and make it into an awesome, pearly substance. Pearl Swirl is a liquid itself, but it’s super concentrated. What’s that mean in the long run? That means that your Pearl Swirl is going to be enough to make over 7L of rheoscopic liquids. You’ve undoubtedly seen Pearl Swirl in shampoos, lotions, cosmetics or even water toys. Pearl Swirl contains suspended microscopic particles that make it easy to visualize currents and the flow of a liquid. So mix in some Pearl Swirl, shake it up and check it out!