Why are there lines on the Deco (rear camera trim) of the Xiaomi 15’s battery cover?

Question

Accepted Answer

Thank you for your support of Xiaomi products. All Xiaomi 15 devices undergo strict professional inspection before leaving the factory. The unique volcano-shaped Deco area in the upper left corner of the battery cover is created through a specialized pure cold engraving process. This process involves intricate and precise craftsmanship, which can result in subtle lines or markings on the surface. These lines are a normal outcome of the manufacturing technique and do not indicate any defect in the product. The pure cold engraving technique allows for a refined, high-quality finish that aligns with the sleek and modern design of the Xiaomi 15, while maintaining excellent performance.