The metal of gold is found in nature in the form of dust; It is in a state of softness and luster, and is characterized by its yellow color. Gold is listed among the very precious metals, chemically denoted by the symbol AU, and takes an atomic number equal to 79 in the periodic table, and its use dates back to ancient times; The pharaohs used it extensively, making coffins, chariots, masks, etc., and this precious metal is considered in both the International Monetary Fund and the Bank for International Settlements as a monetary base for them.
Man purifies gold in his mother state (tabr) by using very strong water currents to help get rid of the sand and alluvial particles that are stuck in it; As these minutes disappear and the gold particles remain as they are due to the high density of gold, elemental mercury can be used to melt gold metal through the distillation of mercury.
uses of gold
The use of gold thanks to its unique properties is widely spread; It is characterized by being ductile and ductile, as well as being easy to shape and resistant to corrosion. These characteristics contributed to giving it the ability to mix with other heavy metals such as copper, silver and nickel. Among the uses of gold:
- Jewelery and adornment industry: Gold is commonly used in the manufacture of jewelery and jewellery, especially yellow gold. Jewelery and jewelery are made by mixing gold with other metals such as zinc, silver and copper in different proportions.
- In medical fields: The development in the medical field accompanied the use of gold in some of its fields. It is used in the following areas:
- In food and drink: Gold is used in the manufacture of some foodstuffs. These materials contain the number E175, and gold leaf is used in the manufacture of some foods, sweets and drinks, including decorative cumin.
- in industrial fields.
- Dental industry due to its ability to resist abrasion and its softness.
- Effective treatment in rheumatic diseases and bone infections using its solution.
- A treatment in some types of cancer, especially radioactive gold 198.
After its manufacture, gold has different calibers. Metallurgists resort to measuring the purity of gold using parts of a thousand, or according to the American scale, it is in caliber. For example, according to the American scale, gold with a degree of purity equal to a thousand is 24 caliber, while gold with 21 caliber is the degree of Its purity is eight hundred and seventy-five. As for carat 18, its purity is seven hundred and fifty. The color of gold is pallor as its purity decreases. As for white gold, it acquires its white color from a mixture of tin and palladium, and the degree of purity is measured in the unit carat.
How to know the gold carat
An experienced jeweler can distinguish the gold caliber of a piece just by looking at it or pressing on it, and all gold jewelry and its products contain the form of a square with the caliber number inside, or the edition may be in the form of three consecutive squares containing the first two squares alphabetically, and it can be done Detecting the gold caliber by adding some special acids to each caliber.
The jeweler rubs this golden piece with a special stone he has, so the piece leaves a trace of golden color on the rubbed stone, and the special acid of twenty-one carat is applied to the existing trace, and in the event that this golden trace disappears, it is a fake, and the stamped numbers can also be indicated on the pieces Gold refers to the carat, for example, the number 999.99 refers to the twenty-four carat, the twenty-one carat is indicated by the number eight hundred and seventy-five, and the eighteenth carat is indicated by the number seven hundred and fifty, and these numbers express the weight of the gold inside the ingot, which weighs one kilogram.
How do you know the caliber of gold?