gold
It is a metal known for its brilliant yellow color and its bile is corrosion resistant, can be traced, pulled and formed. It is not affected by acid but dissolves in royal water. Royal water is acid mixture of hydrochloric and nitric. The gold density is 19.3 grams Cubic centimeter, is found in nature in the form of veins in the ground or granules within rocks or in riverbeds, and may be associated with copper or lead.
Gold was known thousands of years before BC, and was famous for the ancient Egyptians (Pharaohs) were made of jewelry for kings, in addition to the use of car decoration and the manufacture of masks and coffins, and the Pharaohs make from thin sheets that thickness amounts of millimeters. Alchemy, which was based on an attempt by scientists to manufacture artificial gold that simulates natural gold, is called gold today and is the basis of criticism used by the International Monetary Fund and the Bank for International Settlements.
Uses of gold
Rare gold is rarely used in applications due to its strong ionity. It is usually mixed with copper, zinc, silver or nickel. These metals give it higher durability and hardness.
- Precious jewelry: In the production of jewelry of yellow gold mixed gold with copper and zinc in varying proportions, and these ratios determine the gold standard, or purity in the piece, and generally the higher the caliber the greater the amount of gold element in the piece and increased yellow color, and when the production of white gold jewelry they mix the gold with the tin or palladium element and this gives the mixture a white color.
- Permanent tooth fillings, due to its resistance to corrosion and its elasticity.
- Treatment of rheumatism and osteoarthritis using gold solution.
- Gold was used to review the wealth of individuals by acquiring golden food utensils, gold-threaded clothing, or gold-plated home decorations such as door handles, water taps, chandeliers, antiques, and other household items.
Gold caliber
The basis of classification of gold bullion based on its purity, ie, the quantity of gold element or metal in it. Compared to other materials (copper), gold is measured in carats, which is equal to one of the 24 gold bars. One coin means that the mixture consists of one part 23 is another part of copper and zinc, ie, the weight of gold in a 1 kg alloy equals 41.6 g. The second caliber means that the mixture consists of two parts of gold versus 22 parts of the other metals, and the weight of gold in an alloy weighing one kilogram equals 83.2 g.
The most famous gold bullets are:
- Caliber 24: The gold is pure gold with a minimum of 99.9%.
- Caliber 22: The amount of gold in an alloy of one kilogram weight is 916.7 g.
- Caliber 21: The amount of gold in an alloy weighing one kilogram equals 875 grams.
- Caliber 18: The amount of gold in an alloy of one kg is 750 grams.
Identify the gold caliber
- Experience: A skilled jeweler can recognize gold and its caliber once it is controlled by pressure.
- The seal: Or stamp on the gold piece:
- A square shape engraved in gold with a caliber (caliber 21k, for example).
- Gold is stamped with 999,99 for the 24, 875 for 21 and 750 for the 18, as these numbers are equal to the weight of gold in grams per one kilogram alloy, and can be obtained by dividing the caliber by the number 24.