This technique uses a very powerful laser beam applied for a very short time to the surface of the finished product. This alters the surface such that the wavelengths that are absorbed or reflected are modified, and this changes the colour.
The technique still needs to be refined, however it will permit the production of items that, on demand, can take a large variety of colours.
In future, as Apple is always very innovative concerning design, on request, we will be able to order machines in colours of our choice.
