The Toughink marking system is for making logos or safety marks on glass prior to toughening. The mark is produced using a small ink stamp and special ceramic ink.
Ink pads (BO6002687), Ceramic ink (BO6002688), and Thinners (BO6002689) supplied separately.
Application note:
During the toughening process the ceramic ink is "baked" onto the glass leaving a permanent mark. The mark left is of similar appearance to a sandblast mark.