A patent has revealed Apple's novel way of reproducing a matte black effect on aluminium, steel and titanium. The anodised coating could be used in multiple applications, including iPhones, MacBooks, iPads and Watches.
https://www.notebookcheck.net/Apple-may-be-bringing-a-revolutionary-matte-black-finish-to-future-iPhones-and-MacBooks.508215.0.html