Viscosity is the thickness of a liquid. Low-viscosity liquids are very fluid (such as water) while high-viscosity liquids are quite thick (such as molasses). The viscosity of oil paints is usually reduced by adding binder (such as linseed oil) and/or solvent (such as turpentine). At a lower viscosity, paint can be brushed onto the canvas more freely and quickly.
Abstract Expressionist New York
The Museum of Modern Art, October 3, 2010–April 11, 2011
MoMA.org/abexny
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