1 599 gold refers to a metal with a gold content of 99.99%, which is usually used to make high-grade jewelry, gold bars and other products. In the manufacturing process of these products, other metals or special chemical elements may be added to change their colors and properties, such as silver, copper, zinc and platinum. The color of 599 gold may be different due to different proportions and treatment methods.

2. The color of gold may also be affected by the gold plating process. In some specific product manufacturing processes, such as electroplating and vacuum coating, the thickness and color of the coating can be controlled by adjusting parameters such as current, temperature and pressure, so as to achieve different visual effects and textures.