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Rheoscopic fluid means "current showing" fluid. Such liquids are effective in visualizing dynamic currents in fluids, such as convection and laminar flow. They are microscopic crystalline platelets such as mica, metallic flakes, or fish scales in suspension in a fluid such as water or glycol stearate.
When the fluid is put in motion, the suspended particles orient themselves in localized, preferential alignment, larger parts of the fluid moving sheer parallel to other parts of the fluid. With appropriate illumination, the particle-filled fluid will reflect differing intensities of light, making the movement of the currents visible.
-  University of Chicago Materials Research Centre Demonstration
- Instructables: Making Rheoscopic fluid
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