Antique glass
Antique glass is produced using the cylinder blowing process, which was probably used around 1200, first in France and then in England.
Antique glass is the current name for the glass that is hand-blown according to historical methods, which is mainly used in restoration and glass art .
When producing antique glass, the liquid glass can be colored in the port (refractory crucible) and matched to the desired color. The color is achieved by adding iron , copper , nickel and other metal compounds up to silver and gold . Even minimal deviations in this addition change the consistency and color. Over 5000 different colors and structures are available.
Like hollow glass , antique glass is made using the artisanal method of glass blowing . The end of an oval blown balloon is opened and the glassmaker's pipe is knocked off to form a cylinder from the balloon, which can then be cut open and smoothed into a plate.
When the hot glass balloon comes into contact with the mold, fine stripes called planes form on the surface of the glass . In traditional production, the glass also contains many small air bubbles. The structure they form is called puffiness .
Real antique glass is manufactured in a thickness of about 3 mm and in sizes of up to 60 × 90 cm. It is used for lead glass and church windows and processed by glass artists into pictures and objects of art.
For so-called new antique glass (also as a product name: light restoration glass), the glass balloon is pulled out into a larger cylinder by being guided in a shape or in a pit along a vertical surface in order to bring it into an elongated shape. In this way, panes of glass can be produced in sizes up to 90 × 105 cm, which are often only 2 mm thick and whose structure looks larger and has less movement .
To produce flashed glass , one or more thin layers of colored glass are placed over a mostly transparent carrier glass, which results in a particularly fine play of light and opens up artistic possibilities for color design.
In contrast to antique glass, cathedral glass is cast or rolled flat and gets its surface structure through embossing or special thermal treatment.
Individual evidence
- ↑ Description of the historical manufacturing process of window glass in English; accessed in December 2016
- ↑ Real antique glass. Glashütte Lamberts, accessed on March 22, 2016 .
- ↑ Real antique glass. Pingel Glass Art, October 25, 2013, accessed on March 22, 2016 .
- ^ Description of the production process of new antique glass, Glashütte Lamberts Waldsassen GmbH; accessed in December 2016
- ^ Representation of the production process of new antique glass, Glas Schreiber, Berlin; accessed in December 2016