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What is the definition of “viscosity”?

Answer

The measure of the resistance of a fluid (in our case, ink) to flow. Absolute Viscosity refers to the ink at its highest relevant point—when it is flooded on top of the mesh. The same ink changes its viscosity (called Plastic Viscosity) when it is put under a shearing-force, i.e. when it is pushed by a squeegee at a certain speed. Quality inks are extremely shear thinning, tacky inks are not.

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