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The right-most droplet has a low contact angle, as it has spread well. The left-most droplet has a large contact angle, as it does not spread over the solid surface. While formulating an ink, contact angles provide a useful indicator of how a modification to the ink will affect its spreading.Ī contact angle can be large or small, depending on the physical properties of the materials being investigated. The figure below shows three different droplets on a surface.
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