Mirror Coated Sunglass Lenses. What makes them as they are?

Unique earth metallic elements are applied to the surface of the lens and embedded in the coating.These can include Titanium,Chromium,and Nickel.Depending on elements  used, the colour of the coating is different.They can appear blue,orange ,yellow ,reddish and combinations of these.Fresh and funky colour tones.They act as a barrier in blocking harmful radiation emitted from the sun.So protecting your eyes can be a rejuvenating experience.They also make your eyes less visible to the observer.Fresh vibrant colour tones! And the greatest part is they can be applied to Frames of your choice.