![]() Ketchup is a shear thinning fluid, rather than a shear thickening fluid. For example, ketchup reacts the opposite way to shear rate than oobleck. There are other types of non-Newtonian fluids that react and change viscosity differently than oobleck. The corn starch and water mixture may be stirred slowly, but if you stir quickly and forcefully, then the fluid becomes thick for as long as you apply the pressure. The viscosity, or “thickness”, in this non-Newtonian fluid changes depending on how forcefully you put pressure on the oobleck. Don’t pour it down the drain because it has the potential to harden in your pipes. When you’re done playing with oobleck, I recommend you dispose of it in the garbage or compost. The corn starch will settle to the bottom, but the fluid can be rejuvenated by remixing it. Oobleck can be stored in a sealable container and played with again during the week. Tap Water Left, Tonic Water Right – The quinine in tonic water glows under a black light. If you replace the water with tonic water, then it will glow when you shine a Black Light Flashlight on it. You can multiply this recipe and fill a kiddie pool for a party. Play with the oobleck using cups, your hands, a hammer, a strainer or a spoon. Add the water a little at a time, slowing mixing until the oobleck has a batter-like consistency. Pour the corn starch into the plastic basin.
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