Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

 Previous item  Up One Level Next item


The degradation product of KERATIN . During the action of the lime liquors on the epithelial cells of the epidermis and sebaceous glands, degradation products are formed which remain in the hides and skins after unhairing, scudding, and washing. They are present, in the form of viscous solutions or jellies adhering to the structures of the thermostat layer, in the region just under the grain surface. They are not readily visible under the microscope, but are precipitated as flocculent masses upon contact with acid solutions. They are removed by the action of enzymes during BATING , and, if not properly removed, will result in a grainy surface that is thick, spongy, and irregular, suggesting the presence of keratose precipitated in the grain layer. (306 , 363 )

[Search all CoOL documents]