Why is the paint on the white car bumper turning slightly black?

[JulietteMarie]

The painting process may vary, resulting in slight color differences. Here are some relevant explanations: 1. Automotive paint: Generally, it is a type of baked paint. In car factories, after the frame and body are welded (and sometimes manually repaired), the next step is painting. Typically, the first step is applying the primer. The bare body shell is dipped into a syrup-like paint tank, then removed and dried to set the primer. Next, it is sent to a dust-free workshop where the topcoat is applied using an electrostatic painting process. The paint is then baked at around 200 degrees Celsius. 2. Topcoat: There are several types, including standard paint, metallic paint, and pearlescent paint. Standard paint consists of resin, pigments, and additives. Metallic paint contains aluminum powder, which gives it a shiny appearance after application. Pearlescent paint incorporates mica particles. Mica is a very thin, flaky material, so its reflective properties are directional, creating a colorful, shimmering effect.