Blown glass I finish in English whose Spanish translation is blown glass . This consists of a technique to inflate the molten glass into a bubble with the help of a blowtorch or tube.

This technique was created in the middle of the 1st century BC, at which time it was unknown that glass had the property of bone inflation, the expansion of a molten drop of glass by introducing a small amount of air.

This property is conferred by various physical aspects that characterize the glass, giving it the ease of maintaining a viscous consistency at high temperatures, which allows the blower to work on it and give it the shape it wants so that when it begins to lose heat when it hardens, it maintains its shape.

Certain blowers often shape the glass while blowing the glass, while others prefer to inflate the glass into a steel mold. These forms are known as free blowing and mold blowing.

The transformations of the glass raw materials begin to appear soft at a temperature of 1,320 degree C and 2,400 degree F.

The blown glass process is carried out in 3 furnaces; the first one is known simply as the oven , the second called the glory hole that is used to reheat the pieces and finally, the lehi or annealed oven used to cool the pieces slowly depending on their size.