Gold and precious metals In the category gold discovery more articles and learn more information about Gold and precious metals Reviews Price Specifications Features Image manuals videos Accessories All this in metal detectors for gold.
Gold and precious metals
Consisting of three metals precious metals:
These minerals are mined from the ground and not to any interference in human composition.
It was named the three precious metals, because they have some of the important characteristics that distinguish it from some other metals. Such as public acceptance of these minerals in people without other metals to make it rank high in minerals, leading to increased demand without other
Gold is a precious metal, a chemical element with the symbol Au symbol and atomic number 79 on the periodic table. A lane and brilliant yellow color, use as a criticism when many peoples and civilizations and Nations, as it is used in jewellery and gems. Exists in nature in the form of granules within rocks in riverbeds, or in the form of veins in the ground, and often there are gold with other metals such as copper and lead, and discovered the largest block of gold in Australia in 1896 and the weight 2 280 an ounce, gold has the advantage of low wear and smoothness as that of more chemical elements.
The presence of gold in abundance when Pharaohs were making from their coffins and their vehicles as they made him a mask of the nicest masks that mankind was made of pure gold to Pharaoh Tutankhamen.
And a gold monetary base used by the International Monetary Fund (IMF) and the Bank of International Settlements (BIS) and the other is astamlat gold used in dentistry and electronics.
Uses of gold
The unique properties of gold of his softness and clouds and diacritics, its resistance to corrosion, making it suitable for many purposes it is mixed with other metals such as copper or silver or nickel to get stronger, and alloys with Platinum within industrial manufacturing of IAF because they are very resistant to chemicals, that gold is the metal of choice in many areas such as:
In ornamental jewelry:
More use of gold in jewelry decorations in the so-called yellow gold, this is done by mixing gold with copper, silver and zinc in varying ratios result in multiple gold bullets, gold purity is measured in parts (part a) or caliber as American standard, for example, the degree of purity 1000 corresponding caliber 24, purity 875 corresponding caliber 12, while 750 corresponding caliber 18, generally the color tends to pallor whenever you lose any caliber number decreased the amount of gold in the The alloy. Either white gold is gold mixed with Tin or palladium to make it white and gold used for jewelry sets are usually white.
Used in dentistry as his softness and resistance to corrosion in the mouth.
Gold solution is also used in the treatment of rheumatism and bone infections
Radioactive gold used (198) in the treatment of some types of cancer
How has gold colors
We have known that pure gold is not if we are to do a pure gold on a busy (ghoishh or Kit, for example) without can add any extras, this is extremely difficult, and why that gold metal metal road prone to distorted by any pressure is so other metals are added to increase secular impart stiffness to a variety to crafts and thin without fear from the deformity if any pressure is , It is worth mentioning here that the additions of other metals added to gold for the purpose of increasing its hardiness have a tremendous impact on the color gold, melting point, and with the addition of other metals to gold for the purpose of acquisition of Crucian Gold needed in the formation of various colors have gone so that if we add other metals to gold would be to calculate the percentage of gold in the alloy and the gold rate will vary depending on the percentage of additive metals known as gold colors , If your caliber is a wrought gold
Colors of gold
Multiple gold colors depending on the ratio of minerals added to gold as explained above, the maximum color that we have a pure gold (raw) and is 24 ratio of gold color in this caliber are 1019-gone, and the reduction and increase the proportion of metals added in offset from the following colors:
• Gold karat 21 KARAT or 875:
Karat 24 equates 875 points from the alloy of gold 875 per thousand gold NET, 125 thousand other metals such as copper and silver.
• 18 KARAT gold or 750:
And means that the alloy of gold of 750 thousand gold NET, and other minerals 250 thousand.
• 22 KARAT or carat gold 916.66:
And is equal to 916.66 points from net went, but infrequent in trading
And it should be noted that there is a (14) and caliber (9) not to help the Ministry of Commerce of precious metals and gems prohibits dealing in the import and manufacture of gold jewellery in 18 karat (750). Where is low caliber, although use of such calibre in other States for example bullet 8 ‘ 9 used in the United States, and 12 and 14 is used in Italy, and 17 in Pakistan, but all these bullets are Arabic States and only regular bullets only 24, 22, 21, 18. And below that is a low bullet