A closer look at how Xiaomi created the iridescent backs of the Mi CC9 and CC9e

The Xiaomi Mi CC9 and CC9e come in three different colors: White, Blue and Black. The Black is pretty standard, but the other two have special finishes on the back to create an iridescent effect (White) and an S-shaped reflection (Blue). Here's how these came to be. The diffraction grating on the Mi CC9 • Compared to the Mi 9 Diffraction grating is used to achieve the rainbow colors of the White models. The Mi 9 had a similar gradient effect on its back created by ridges etched into the glass, but those were one dimensional. The CC9 back is etched in two directions, which...