Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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wetting agent

A substance, usually a SURFACE-ACTIVE AGENT , which reduces the surface tension of a liquid and therefore increases its adhesion to a solid surface. Improved wettability is observed as a lower (often zero) contact angle between the solid and liquid. A wetting agent usually consists of a molecule with a hydrophilic (water attracting) group at one end and a hydrophobic (water repelling, and therefore oil attracting) group at the other. Wetting agents are used to improve absorbency of blotting papers, and for improving dispersibility of pigments. such as calcium carbonate and titanium oxide. (98 , 222 )




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