CONSTANT MOTION Glass blowing is often more than a one man job because of the constant motion the process requires. The artists will sit and rest the pipe on the steel “arms” of a bench they are using while turning it with one hand, and someone will often blow a bubble into the molten glass they are rotating from the other end. The process requires perfect coordination with the left and right hands.	COLORED GLASS Adding color to a glass piece requires various forms of colored glass like powders, frits and bars are used to create patterns and designs along the piece. The process begins with the artist heating glass on the iron rod and rolls it along the colored glass like the image above, picking up the pieces which each roll. Then it is sent into the furnace called the “glory hole” as mentioned before, to keep the shape of the piece.	AIR BUBBLES Hand-blown glass pieces occasionally have small air bubbles inside the glass, intentional and unintentional. These air bubbles can become trapped inside the heated glass during the blowing process, and some are necessary and encouraged to create an aesthetic feature.
FURNACES The transformation process of raw glass takes place at around 2500 °F, and then the working temperature is reduced in the fist furnace to around 2,000 °F. From this stage the glass changes from a white to orange glow. While the artist is working and blowing into the glass, it drops down to between 1,600 and 1,900 °F, to 1,350 °F.	FURNACE CONTINUED There are three types of furnaces: The first one contains a hole of molten glass, and is referred to as the furnace. The second is called the glory hole, and is used to reheat a piece in between steps of working with it. The third furnace is referred to as the lehror annealer, which gradually cools the hot glass over a period of 75 hours or longer, depending on the size of the piece. The third furnace is vital because it keeps them from cracking and shattering due to the stress.	PONTIL SCARS are left on the bottom of the blown glass piece, usually where it stands, when the artists moves the molten glass from the pontil iron rod they were utilizing to heat inside the furnace. When glass art is created mechanically, it will not have this unique touch to it. Some glassblowing studios use pontil irons with their own unique symbols on the end to mark into a sort of logo on each hand-blown piece.