What is the purity of gold? When buying gold, most people pay attention to the purity of gold. For example, we often hear 24K gold, 18K gold, etc., but the purity of gold is not just this expression method. Here is how to see the purity of gold. Various gold purity notes and gold purity calculation formula, gold unit of measurement.
Gold purity text comment
Some gold jewellery is marked with a text mark. The stipulation is that the gold content of the gold is not less than 990 ‰, and the gold content of the 999 gold is more than 999 ‰. China has regulations on gold product imprints and signage, and generally requires production company code, material name, content mark, etc., without marking as unqualified products, internationally. However, for some particularly small products, it is also allowed to mark.
Gold purity number annotation
For example, 99 gold means "full gold" and 9 gold means "thousands of gold." However, since May 4 last year, the title of the thousand-foot gold that has been in use for 14 years will be abolished, and the gold jewelry will be unified by the gold and the nominal content.
Gold purity score annotation
For example, it is labeled 18/24, that is, the color is 18K (750 ‰); it is labeled 22/24, that is, the color is 22K (916 ‰).
The above are several expressions of gold purity. Among these notes, the most common ones are score notes. For example, we often see 24K gold, 18K gold, etc. in jewelry stores; 18K gold is impure gold, for How do these metals measure its purity?
The national standard GB11887-89 stipulates that every K (English carat, German karat abbreviation, often written "K") gold content is 4.166666%, China's K gold in the early days of New China is calculated according to the standard of 4.15% per K pure gold After 1982, it has been unified with international standards, and the gold content per K is 4.166%. From these, the purity of the purchased K gold can be calculated.
Yellow (K) gold purity formula: color = K to * 4.166%
Gold unit of measure
Dioctyl Phthalate(DOP)
Di Octyle Phthalate(Dop),Di Octyl Phthalate,Dop Dioctyl Phthalate,Dioctyl Phthalate Adalah
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