Viscimetry

Viscimation is the turbulence when liquids of different viscosities mix,particularly the formation of vortices (called "viscimetric whorls") and visible separate threads of the different liquids.

The term is archaic and idiosyncratic to whisky 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.

References

* http://www.islaywhiskyclub.com/chapters%20archives/Article.htm
* http://www.smws.ch/downloads/Newsletter-Xmas2004-en.PDF