Apple's concept for coloring carbon or even glass fiber devices was revealed in a patent application published by the U.S. Patent and Trademark Office entitled "Composite Laminate having an Improved Cosmetic Surface and Method of Making Same," it describes a composite laminate placed over the frame of the device, including a "scrim layer," to allow a product like a MacBook Pro to be painted a variety of colors.
The application notes that carbon fiber composites offer many benefits, as they can serve as a strong, lightweight housing for electronic equipment. But carbon fiber composites are also typically black, and the fibers themselves are usually visible on the surface of the device. Apple said the fibers of such material are usually variable in construction, offering a varied appearance on the surface. As a result, carbon fiber can feature cosmetic imperfections that would reduce the aesthetic appearance of a device.
Apple's solution is a composite laminate that includes a plurality of sheets that could be colored. These sheets would be formed of fibers pre-impregnated with resin. The composite laminate surface placed on the outside of the device could allow it to retain a color, and an exterior scrim layer would give a device enclosure a "consistent and pleasing cosmetic surface," Apple said.
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