Make Your Own Rheoscopic Fluid Jar
Rheoscopic fluid is used to visualize the subtle currents in liquid. It works similar to dropping dye into the fluid to highlight currents, but rheoscopic fluid will never mix!
Materials: old water bottle (clean and dry), mica powder or silver calligraphy ink, tap water, food coloring or highlighter
Directions: 1 liter tap water to ¼ teaspoon of mica powder, 1-2 drops of food coloring. Pour into bottle and mix.
Check out the science behind the effect and check out the full tutorial here.
*Note: Mica powder can be found at most craft stores with ink or stamping supplies.