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Gold leaf production process and history


Gold leaf is a thin sheet of gold hammered. Because gold has excellent plasticity and ductility, one or two (31.25 grams) of pure gold can be hammered into gold foil with a thickness of 1/10000 mm and a total area of ​​16.2 square meters. Everyone's praise for gold often reflects the unique processing technology of gold, such as "golden branches and jade leaves" and "gold and brilliant". What is described is a key type of gold processing technology-gold foil.
The traditional production process of gold foil uses gold with a recognition degree of 99.99% as the key raw material, and undergoes a unique production process of more than ten processes such as polyester, pounding, and foil cutting, so that it has a golden color, bright and soft. It is as light as a feather, and as thin as paper, and the thickness is not enough 0.12μm. Today's gold foil manufacturing has incorporated modern science and technology, and the applied auxiliary materials (such as Wujin paper) and machinery and equipment have already been greatly innovated, and the production volume and quality have been greatly improved. Modern science and technology carry forward the traditional gold foil processing technology, and develop and design new types of gold foil, such as the use of new technology laser light carving techniques, hand-carved and hot stamped on gold foil with a purity of 99%, with appreciation, Personal collection, souvenirs and appreciation of use value.
Gold has stable characteristics, permanent colorfastness, anti-oxidation, anti-humidity, anti-corrosion, anti-mold, anti-moth bite, anti-electromagnetic radiation, and gold foil made of gold has universal main uses. The gold leaf of the ancient French period is the first to purify the gold, and then through the percussion of the steel to become a gold leaf with a total area of ​​2.5 cubic centimeters, and then sandwich it in the oojin paper that is smoked with gasoline, and then go through 6-8 hours of handwork. Make a hammer to make the gold leaf into foil, the total area is equal to forty times the gold leaf, and then cut into a square and serve. Gold foil is a traditional artwork of Chinese culture. It originated from the Jin Dynasty and was perfected in the Northern and Southern Dynasties. It was fashionable in Song, Qi, Liang, and Chen. Now the Longtan area of ​​Nanjing (Nanjing Jiangning) is the origin of gold foil, which has a history of nearly 1700 years. time. The runes of Cixi Mausoleum in Dongling Tomb in Beijing are typical gold leaf products.
Among the metal commemorative stamps, the more expensive ones are counted as gold foil commemorative stamps. In 1966, Gabon sold the world's first pure gold foil commemorative stamp with a denomination of 1,000 francs in mourning for the 1952 Nobel Peace Prize winner, French philosopher, composer, and theologian Switzer. Because the gold does not fade, the design is clear, beautiful and elegant, and the first batch of 50,000 pieces were sold out. Then, Gabon sold gold commemorative stamps several times. Other precious metals have also been used as materials for commemorative stamps: in 1961, the former Soviet Union sold silver commemorative stamps; in 1966, the United Arab Emirates before reunification sold a set of six silver commemorative stamps. Stamps, this is also the world's first set of silver foil commemorative stamps. In the history of the issuance of metal commemorative stamps, Tonga's approach has practical significance as a landmark. Tonga chose the embossing method of metal foil for printing, which greatly improved the applicability of commemorative stamps, and many countries have followed suit.
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