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I was just wondering with all the various banners and iconography of the Imperium, what are the official colours of the Imperium?

I'm not sure if the Imperium has distinctive colours - but I guess black and white would be the closest thing to it? You very often see the white Aquila on black ground. All the Adepta have their icons painted in the same way, too. Even the AdMech follows this scheme with their skull-and-cog logo.

Official colors like a national flag?

Mechanicum is representd by red, so maybe parts of the IoM have a "official" color.

Could be bleached bone for the general Imperium with all the skulls there.....