Abstract: A blank mold sooting process in which a lubricating or detaching layer is formed on the internal walls of the blank mold, by igniting an acetylene flow with piezoelectric electrodes, a voltaic arc generator, or an electrical resistance. The process is performed utilizing, for example, a blow mold and an invert, and the invert can be utilized to transfer a collar from the blank mold to the blow mold.

Abstract: A glass making apparatus adapted to deposit a lubricating/detaching layer of carbon black obtained from acetylene cracking on the internal walls of a blank mold (1, 18). The glass making apparatus includes a blank mold (1, 18) having an open top and an open bottom (10); a collar (6) sized, shaped, and positioned to selectively plug the open bottom (10) of the blank mold (1, 18) during a glass forming process and to disengage from the open bottom (10) of the blank mold (1, 18) during a blank mold sooting process; a ring (7) disposed in the collar (6); a plunger (8, 14) sized, shaped, and positioned to selectively move up into the collar (6) and down out of the collar (6); and a sleeve (9) surrounding the plunger (8, 14).