Raw gold is also known as natural gold, barren gold, the original gold, is the object of the cooked gold, is mined from mines or river bottom alluvial layer, without melting and refining of gold. Raw gold is divided into mine gold and sand gold two kinds.
Mine gold, also known as synthetic gold, produced in mines, gold mines, most of the hot springs with the underground gushing through the rocks of the seam fine and precipitation accumulation, often with the quartz sandwiched in the crevices of the rocks, the ore after mining, crushing, panning, the gold can be directly picked up the big ones, small grains of the mercury can be used to dissolve. Most of the mine gold and other metals associated with, which in addition to gold and silver, platinum, zinc and other metals, in the other metal is not put forward before known as synthetic gold. Mineral gold produced in different mines and other metals contained in different compositions, therefore, the color varies, generally between 50% -90%.
Sand gold, is produced in the river bottom or low-lying areas, so the stone sand mixed together, after panning out of the gold. Sand gold originated in the mines, is due to the gold ore exposed to the ground, after a long period of wind and rain, the rock north weathering and crumbling, the gold will be detached from the vein along with the sediment downstream, the natural precipitation in the rock and sand, in the bottom of the river or sand and gravel below the deposition of the gold-bearing layer, thus forming the sand gold. Sand gold is characterized by: particle size, large like beans, small like fine sand, different shapes. The color is different due to the color of the high and low, more than ninety percent of the reddish yellow, eight become light yellow, seven become greenish yellow.
Cooked gold is raw gold after smelting, purification of gold, generally higher purity, finer density, some can be used directly for industrial production. Common gold bars, blocks, ingots and a variety of different jewelry, utensils, gold coins, as well as industrial use of gold wire, sheet, plate, etc.. Due to different uses, the required color varies, or due to the lack of purification equipment, and only melted not purified, or mention the purity is not enough, the formation of color varying high and low gold. People are used to according to the color of the high and low into pure gold, red gold, color gold 3 kinds. According to the different gold content is divided into clear color gold, mixed color gold, k gold.
Gold after purification to achieve a fairly high purity of gold is called pure gold, generally refers to more than 99.6% of the color of gold.
Red gold and pure gold meaning close to the idea, but because of the time and place of the different, red gold standard is different, the international market for gold, color up to 99.6% is called red gold. And the territory of the red gold is generally between 99.2%-99.6%.
Color gold, also known as "second gold", "tide gold", refers to the lower color of gold. These gold due to other metal content is different, the color of the high 99%, low only 30%.
According to the different division of other metals, gold can be divided into clear gold, mixed color gold, k gold, etc.. Clear color gold refers to gold only mixed with silver components, regardless of the color high and low collectively known as clear color gold. Clear gold is more, common in gold bars, ingots, blocks and a variety of utensils and gold jewelry.
Mixed-color gold refers to gold in addition to silver, but also contains copper, zinc, lead, iron and other metals. According to the different types and quantities of metals contained, can be divided into small mixed gold, large mixed gold, bronze large mixed gold, lead-containing large mixed gold and so on.
k gold is silver, copper in a certain proportion, in accordance with the formula of the full gold for 24k formulated into gold. Generally speaking, k gold containing silver proportion the more, the more green color; Containing copper proportion is large, the color is purple red. China's k gold in the early liberation is calculated according to the standard of 4.15% per k. After 1982, has been harmonized with international standards to 4.1666% per k as the standard.