The Marbling of Book Edges
and Paper.
THE MARBLING OF BOOK EDGES
AND PAPER.
The Marbling consists, generally speaking in this, that finely ground fluid colors are thrown in drops by the aid of brushes on a thickly fluid size contained in a flat trough, that then by the aid of gall, different marble-like designs are formed, that they are lifted off the size by immersing the edge of the book and by that are transferred on this edge.
Before speaking of the different kinds of edges, I will mention something of the harmony of colors, as in drawn edges the real harmonious combination of colors is of great influence on their beauty. The application of color in the art of marbling gives us certainly extraordinary freedom and a wide range to our fancy, but nevertheless there are certain principles or laws necessary to make the colors appear in an effective and beautiful way. Those tones of color which lie between yellow and reddish yellow are called warm, those between blue and the middle of reddish blue, cold colors. In the center lies red by its strength and effectiveness forming the dividing line between the warm and cold.
To explain the principles of color harmony, the colors are divided into three groups, first, primary colors, second, secondary, and third, tertiary.
Primary colors are those which cannot obtain their inherent purity by any mixture, namely red, yellow, blue, white and black. Secondary are those which are generated by a combination of two primary colors, for instance, orange, purple, green and grey. Tertiary, or broken colors, are those which are obtained by mixing two equally powerful secondary colors, for instance, brownish red, olive, slate grey, etc.
In the harmony of colors luminosity and intensity play the main parts. The darkest color must occupy three times as much space as the lightest and the succession must be kept up in this way always taking into consideration the luminosity of the colors.