Soap reduces the surface tension of milk, driving a flow that mixes in food dye.

By Zachary Wehner for Spring 2013 Get Wet.
Read the Report

Soap reduces the surface tension of milk, driving a flow that mixes in food dye.

Food dye in milk.

Food dye follows the wake of a finger in milk.

An upside-down image of a dyed ice cube melting in water illustrates the Rayleigh-Taylor instability.

Food dye falling through water is reflected in the water surface when viewed from below.

Water and glass act as lenses for observation of food dye in water.

Food dye dropped into water exhibits the Rayleigh-Taylor instability, forming vortex rings as it falls.

Food dye exhibits the Rayliegh Taylor instability, forming toroidal vortex rings in a mirrored image.

Iodine forms multiple vortex rings as it falls through water after falling through canola oil.

A snake and eagle can be seen as tea falls from a tea bag due to the Rayliegh-Taylor instability in this inverted image.