The national standard gold content is not less than 99%, so AU900 is not pure gold, and AU900 gold content is only 90%. AU is actually only a symbol of gold purity. au900 is also quite common in jewelry stores, and it is a dragon and phoenix bracelet in wedding suits.
The button part is usually made of au900. Because of the soft texture of gold, this bracelet is made very wide and thin. Therefore, the buttons need to be reinforced, using au900 gold to prevent deformation or damage when wearing.
Then, like this bracelet, other locations are generally au999, which is what we call 24k gold. Au900 is light yellow or golden yellow, which looks bright, but not very pure. Another place is the gold earrings behind the gold earrings. The general material is also 900, otherwise it will not be buckled.
How much gold does au900 have?
Au900 is an alloy with a gold content of about 90%. Because gold is soft, the hardness of gold will be greatly increased after it is mixed with other metals. Will be more suitable for jewelry. The gold content of the alloy can also be expressed by K. The common 18k and 22k represent 75% and 9 1.6% gold content respectively.
Au900 refers to gold with 90% gold content. For example, 0.9 g of au900 gold is au element, and the remaining 0. 1 g is Ag, Ag or Cu. The mixing of these elements endows Au900 gold with higher plasticity, and the general style will be more novel and beautiful, but the labor cost will be much higher than that in Huang Jingui. If the need for preservation is considered, it is not very cost-effective, but it is also not very cost-effective.
Because gold recovery depends only on the gold content, the lower the gold content, the greater the loss when it is recovered and realized.