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Halo: Combat Evolved is a 2001 military science fiction first-person shooter video game developed by Bungie and published by Microsoft Game Studios. The first game of the Halo franchise, it was released on November 15, 2001, as a launch title for the Xbox gaming system, and is considered the platform's "killer app". More than five million copies were sold worldwide by November 2005. Microsoft released versions of the game for Microsoft Windows and Mac OS X in 2003, and the surrounding storyline was adapted and elaborated into a series of novels, comic books, and live-action web series. The game was later released as a downloadable Xbox Original for the Xbox 360. A high-definition remake, Halo: Combat Evolved Anniversary, was released for Xbox 360 on the 10th anniversary of the original game's launch, and was rereleased as part of Halo: The Master Chief Collection on November 11, 2014, for the Xbox One.

Halo is set in the twenty-sixth century, with the player assuming the role of the Master Chief, a cybernetically enhanced supersoldier. The player is accompanied by Cortana, an artificial intelligence who occupies the Master Chief's neural interface. Players battle various aliens as they attempt to uncover the secrets of the eponymous Halo, a ring-shaped artificial world. The game has been commended for elements such as its story, the variety of strategies players can employ, and its multiplayer mode; however, the repetitive nature of its level design was criticized by some reviewers.

Rubixanthin, or natural yellow 27, is a natural xanthophyll pigment with a red-orange color found in rose hips. As a food additive it used under the E number E161d as a food coloring; it is not approved for use in the USA or EU but is approved in Australia and New Zealand where it is listed as 161d.

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