Hello,
I just found this while randomly searching for completely unrelated images.
There appears to exist a product called chameleon nano flakes that, when mixed into a clear medium and applied over a surface, give a multi.colour effect depending on the light conditions, like those cars you see in real-life that have that rainbow-varnish on them and shimmer mainly in greens and oranges.
Very interesting, apparently useful for a wide range of objects, such as (obviously) vehicles, visors, goggles, energy shields and swords, etc.
Link