Stormtroopers are usually in a white livery. The reason for the black as seller Scrapbookingbutterfly explains is that:
For much of the Galactic Civil War, a mysterious agent of the evil Sith Lord Emperor Palpatine, code-named “Blackhole,” carefully gathered intelligence data for the Galactic Empire. Blackhole had an impressive arsenal of weapons available to him, including a Star Destroyer, the signature vessel of the Imperial Starfleet. The Stormtroopers under Blackhole’s command were known as Shadow Stormtroopers. Their armor was cast in black stygian-triprismatic polymer which had increased sensor-stealth capabilities, allowing them to move about the galaxy undetected.
With a starting bid of $649.00 you would be forgiven for thinking that the helmet really is made of black stygian-triprismatic polymer, but it's probably made of plastic. It is wearable though, with a padded lining. Pretty cool, but at that price only for serious SW geeks. [link]
