What do the vernacular black skates mean?

Black ice is a new technology. After a long time, it will gradually become brighter, but it will still be black. I've seen black ice used for 1 year. Its four corners are a little brighter and discolored, and its surface has very fine scratches. In short, it is possible. Personally, I don't think it's that exquisite.

The black ice series adopts PVD dip dyeing process, in which a layer of film is dipped into a semi-dissolved state with liquid, and then the whole lighter is firmly wrapped. In 2002, the black ice series has been well received in small-scale tests, and works such as lithography, color printing, etching and badges have excellent effects.