Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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1. A deep blue, semi-precious stone, which, when ground into a powder, was used as ultramarine, a pigment now produced synthetically. It is a metamorphic rock, and its color stems from the blue feldspathoid lazurite, which is normally (NaAlSiO NaS); however, the properties may vary significantly in both the natural and synthetic products. It is used from time to time in the ornamentation of bookbindings and the coloring of paper. 2. A clear blue marble veined with gold. The blue is in the form of large irregular spots, of a cloudlike appearance, becoming an increasingly darker shades of blue as the color is applied several times. The gold veins are produced by gilding. (152 , 235 )

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