When shopping, we sometimes find the name forging gold, gold and other words in the label some gold jewelry superscript, some consumers do not know the cloud,some consumers will buy it for gold jewelry.
actually, this jewelry is not made of pure gold, but in a metal surface is plated with a layer of gold, or wrapped in a layer of gold, like bread, so, people call them"sandwich" jewelry.
on this "sandwich" housing name, jewelry equipment industry standard "jewelrygold overlay thickness provisions" also made a request: the use of mechanical processing method will firmly wrapped in gold jewelry products substrate of gold coating, called gold capping; obtained by electroplating or chemical plating processmethod of gold coating, called the gold layer.
such plating (package) gold products fashionable, affordable, rich market,beautify life, by the love of the people, but the key is, businesses are properly marked logo, will tell the real consumers, don’t let them eat yabakui.
24K gold jewelry you buy that?
in 1993 and 1995, the State Bureau of technical supervision organized twonational supervision of gold jewelry, jewelry equipment product qualified rate were 87.5% and 91.05%, product unqualified mainly in gold content.
Provisions of the state standard "one of the precious metal jewelry naming method": the minimum content of noble metal elements of the fineness of precious metal alloys, in thousands of scores of precious metals; purity with the lowest values,there shall be no negative tolerance; the gold content of gold jewelry demand thatnumerical product content mark (i.e. general commonly known as the 99 or 9999) is the lowest, in thousands of scores, there shall be no negative tolerance, the measured value is lower than the content mark numerical product is unqualified products.
in order to facilitate sales, some enterprises in product shows that numerical products gold imprint is too high, often hit the 9999 mark, and consumers that thepurity is higher. The provisions of national standards of jewelry, gold content qianfenshu of not less than 990 of the known gold; gold content qianfenshu of not less than 999 of the known as the thousand pure gold; the theory of 24K purity.The content of one hundred percent. That is to say, 24K gold jewelry is not exist,consumers should not be deceived.
as industrial gold, the purity of raw material supply enterprises truly achieves above 9999 is not much, jewelry equipment after processing jewelry products and its purity reached 9999 is more difficult to guarantee. Therefore, the experts believe that, as jewelry, purity can reach more than 1000 gold is high purity of gold jewelry.Purity from a decorative point of view, from 990 to 999 ~ 9999, appearance and not much difference. In foreign countries, the popular jewelry is K gold jewelry, almost difficult to see more than 990 accessories. Therefore, consumers don’t need to go to the pursuit of gold content of 9999 or so called 24K gold jewelry productionenterprise, there is no need to cater to consumers and risking product unqualifiedcall 9999.