By covering the glass surface with special foils, the uncovered parts get matte, while the rest remains clear. When gradually removing the cover foils, multi-stage effects, respectively different opacity levels can be achieved.
The glass surface can be carved deeply with a special foil that resists the sandblast particularly well. Even holes (for outlets, wash basins and so on) can be achieved, which is very suitable for complicated holes, cutouts and recesses and in cases when a CNC machine or a water jet cutter cannot be used or are too costly.
Stencil foils are either produced manually, based on old handcrafting techniques, or by using a computer: here again, the foils, which are manufactured by a cutting plotter, have to be taken and transferred onto the glass by hand. In the case of patterns that are too small for foils and the plotter, foils produced by photo technique are applied, which allows letterings and griddings in the range of millimeters.