Lacquering is a finishing technique that involves applying a layer of lacquer to the edge of a book. The process begins with surface preparation, which includes sanding to ensure smooth and even finish. Once ready, the lacquer is applied, which can be water- or solvent-based. After application, it is crucial to allow proper drying time. Several layers of lacquer can be applied to achieve a deeper and longer-lasting effect. Finally, the surface is polished to enhance the shine and protection of the book. 

This process not only improves the book's appearance by making it smooth to the touch and to the eye, but also preserves it from wear, moisture and environmental damage.