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Violation of the Signature policy
The technique employs pure chakra. Chakra color varies from person to person, so in theory, Rasengan used by 100 people could have 100 different colors (or rather shades of). Naruto's chakra being yellow (canonically anyway) is known since very early chapters, so logically so would his Rasengan be.--Elve [Mod] Talk Page|Contribs 13:52, October 28, 2014 (UTC)