Viscimetry
Encyclopedia
Viscimation is the turbulence
Turbulence
In fluid dynamics, turbulence or turbulent flow is a flow regime characterized by chaotic and stochastic property changes. This includes low momentum diffusion, high momentum convection, and rapid variation of pressure and velocity in space and time...

 when liquids of different viscosities mix,
particularly the formation of vortices
Vortex
A vortex is a spinning, often turbulent,flow of fluid. Any spiral motion with closed streamlines is vortex flow. The motion of the fluid swirling rapidly around a center is called a vortex...

 (called "viscimetric whorls") and visible separate threads of the different liquids.

The term is archaic and idiosyncratic to whisky
Whisky
Whisky or whiskey is a type of distilled alcoholic beverage made from fermented grain mash. Different grains are used for different varieties, including barley, malted barley, rye, malted rye, wheat, and corn...

 tasting;
their study (or appreciation) is called viscimetry, and the capacity of a whisky to sustain viscimation (which is predominately its alcohol percentage) is called viscimetric potential or viscimetric index.

Causing viscimetric whorls by adding water to liquor is called "awakening the serpent".

Not to be confused with viscometry.
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