Bright gold

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Bright gold decoration on glass

Bright gold is a precious metal preparation for decorating glass and ceramics . Like all gloss preparations, it is an oily, sulphurous and resinous solution and contains gold in the form of gold (III) chloride , as well as rhodium , bismuth , lavender oil and resins .

Bright gold was invented in 1827 by Heinrich Gottlieb Kühn in the Meissen porcelain factory . In 1879, Heinrich Roessler developed a process for the industrial production of bright gold preparations in his company Degussa AG , which enabled the broad use of bright gold from 1880 onwards. In 1896, Richard Küch created the process technology for the Heraeus company to produce bright gold on a large scale.

Bright gold

Bright gold is processed as a brown-black liquid. Its gold content is between 6 and 25%. The firing temperature is approx. 800 ° C. In contrast to polished gold, it comes out of the decor firing shiny, provided the surface to which it is applied is smooth. It stays matt on rough surfaces. The gold polishing process is saved with bright gold . In addition, it is cheaper than polished gold due to the lower gold content and the low layer thickness of only one µm . Bright gold has a typical reddish-gold color because it is based on pure gold.

Bright lemon gold

Shiny Lemon Gold, also written as Luster Lemon Gold or Lemon Gold for short, contains silver . In general, the gold-to-silver ratio is 10: 4. This is why this glossy preparation shows a light gold tone.

Bright gold decoration on household porcelain

Shiny platinum

In addition to gold, shiny platinum also contains approx. 5% platinum . Other platinum metals can also be mixed in. It has a white gold color. Otherwise, the production and processing of this glossy preparation is analogous to bright gold.

Shiny silver

Bright silver is manufactured and processed in the same way as bright gold. Pure bright silver tends to black start , which in the formation of silver sulfide is. That is why tarnish-proof shiny silver is mixed with approx. 4% gold and approx. 1% platinum. However, bright palladium is being used more and more often.

Bright palladium

In this glossy preparation, platinum is replaced by palladium . Similar to glossy platinum, it has a white gold color. By reducing the gold content, it can take on a white, i.e. silver, color. Otherwise, the production and processing of this glossy preparation is analogous to bright gold.

See also

literature

  • Hans Blücher: Information book for the chemical industry . Leipzig 1918.
  • Wolf E. Matthes: Ceramic glazes: basics, properties, recipes, applications ; 2. through Edition; Augustus-Verlag, Augsburg 1990.
  • Ekkehardt Kraemer (ed.): Saxon-Thuringian manufactory porcelain. Glass ceramic publicly owned foreign trade company of the German Democratic Republic, Berlin 1985.
  • Hermann Heuschkel, Gisela Heuschkel, Klaus Muche: ABC ceramics ; 2. heavily revised. Ed .; German Primary industry publisher; Leipzig 1990.

Web links

Individual evidence

  1. ↑ Presentation of the company geschichte.evonik.de; accessed on September 22, 2014
  2. ↑ Presentation of the company heraeus-preciouscolours.de; accessed on September 22, 2014