Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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The process of removing film from the surface of marbling size. The film results from evaporation and must be removed before the colors are placed on the size, otherwise they will not expand properly. It must be done quickly and the colors dropped on immediately so as to prevent another film from forming. Skimming may be done with a skimmer, a device attached to the marbling trough, and which is raised and lowered on both ends, according to the quantity of size in the trough. The rubber blade which skins the size allows for a clean skim, and, being supported on the rim of the trough, assures an even and quick pull which does not disturb the size. (264 )

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