A specific instrument termed manereta or sgraffon is used to comb through the threads and make wavy or feather-like decorations on a glass object's surface after the first phase.
A specific instrument termed manereta or sgraffon is used to comb through the threads and make wavy or feather-like decorations on a glass object's surface after the first phase. Afterwards, the piece is reheated, tumbled on the marver, and blown once more, creating new designs and patterns.