Gold has five nines, that is, high pure gold, and the recognition rate is about 99.999%.

Because the purity of high-purity gold has exceeded the international maximum standard of gold purity, its color is reddish gold, which has good plasticity and ductility, very high thermal conductivity and electrical conductivity, and its characteristics are very stable. Tiger balm has its unique orange luster (except low fineness), and pure gold can also shine brightly under obvious light sources, which other metal materials, including copper, do not have.

Wujiu gold is the purest gold on the market at present, and its price is a little more expensive than ordinary pure gold and ten thousand gold, which are generally gold. Although the purity of high-purity gold is extremely high, the material is extremely soft. Therefore, high-purity gold is mainly used for bonding alloys in semiconductor components and large-scale integrated circuit chips, as well as sputtering targets, or high-purity gold-cobalt alloys, which are not easy to be used in jewelry design industry.