Gold foil is a thin sheet hammered with gold. One or two (365,438+0.25 g) pure gold can be hammered into gold foil with a thickness of one tenth of a millimeter and an area of 65,438+06.2 square meters due to its good ductility and plasticity. That is, one gram of gold can be made into pure gold foil of about 0.5 square meters with a thickness of 0. 12um.

Gold has the characteristics of stable nature, permanent discoloration, oxidation resistance, moisture resistance, corrosion resistance, mildew resistance, insect resistance and radiation resistance. Gold foil made of gold is widely used.

In ancient times, the method of making gold foil was to purify gold, then beat it into gold leaves with an area of 2.5 square centimeters with a thousand hammers, then put it into black gold paper smoked with kerosene, and then beat it for 6-8 hours by hand to make the gold leaves into foil, about 40 times the area of the gold leaves, and then cut it into squares.

Gold foil is a traditional handicraft of the Chinese nation, which originated in the Eastern Jin Dynasty, matured in the Southern Dynasties and was popular in Song, Qi, Liang and Chen Dynasties. Today, the Longtan area (Jiangning) in Nanjing is the birthplace of gold foil, which is said to have a history of nearly 1700 years. The inscription on the tomb of Cixi in Dongling, Beijing is a typical gold foil product.

The gold foil made by traditional technology takes gold bars with 99.99% gold content as the main raw material, and after more than ten special processes such as chemical cleaning, hammering and foil cutting, it is golden in color, bright and soft, as light as a feather, as thin as a cicada's wing and less than 0. 12 micron in thickness.

Extended data:

1, check the joints regularly.

Hetian gold inlaid with jade is inlaid together, so the perfect combination at first will change after wearing it for a period of time. Therefore, we wear the Hetian gold inlaid jade pendant next to our body, and we must check it regularly at the joint between metal and Hetian jade. If it is found to be loose or abnormal, it needs to be repaired in time to prevent future problems.

2. Pay attention to avoid bumping.

Gold inlaid with jade, like gold, can't stand the impact of external forces. Gold has low hardness and is easily deformed. Although the hardness of Hetian jade is great, it is easy to crack when it is hit by external force, and it will even break directly when it is serious! Sometimes some dark lines produced by collision are invisible to the naked eye, but their internal structure is destroyed, which directly affects the beauty of gold inlaid jade itself.

3. Avoid exposure to high temperature and sunlight.

Runyu is a description of the characteristics of Hetian jade. This sentence explains the characteristics of Hetian jade to the fullest. Hotan jade will expand when heated for a long time, and its molecular volume will increase, which will make the rare water in jade lose its moist characteristics and affect its jade quality and color.