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As drying proceeds, the ratio ΔΓ/(−Δf) decreases, while the power law exponent of −Δf(n) increases. This can be explained with the formation of a solid film at the substrate surface. In the limit of the dry film, the ratio ΔΓ/(−Δf) goes to zero and −Δf scales as n (not as n1/2, as in the case of the Newtonian liquid.) The deposition of solid matter at the substrate surface drives the system in this direction.
