I was reading the New Scientist the other day when I came across this mini paragraph about a new invention for paint. It's made from aluminium nanoparticles, and gets its colour from trapping certain wavelengths of light, rather than using traditional pigments. It means not only is it lighter, but it also won't fade over time.
After my recent debacles with applying a UV varnish to protect my paintings from fading, this is a very exciting development in the world of pigment and colours. And although it will currently be used for commercial things (such as planes) I'm sure it won't be long before it trickles down to the artist community and we can use it on our paintings!