This technique is a cold process technique and serves to attach decorations on the glass surface. It has its origins in Bohemia in the 16th century. Today, lathe and attachments make these glass objects in different sizes. There are two variants. One is the use of silicon attachments, the other one is the use of soft metal attachments, made of e.g. copper. They are provided with abrasive powder in differently sized granules. By that, you can attain even more accurate and finer results. Despite the instability of Murano glass, (unlike Bohemian glass), glassblowers like Francis Pelzel for S.A.L.I.R. and Francesco Andolfato have achieved impressive results.