The colours red and blue used by Indigenous Peoples
Red and blue (and sometimes black) are some of the ritual colours some native people paint themselves with which serve as reminders to those people of their origins in the Pleiades and Sirius systems. On a very basic level, red is used by indigenous human groups who have a strong connection with the Pleiades system while blue is used by those with a strong connection with the Sirius system. Often you find that some native peoples use both red and blue in their ritual dances or ceremonies. This signifies the connection to both Pleiades and Sirius.
Interestingly in the movie King Arthur (2004) with Clive Owen and Keira Knightley, the Celts, when they went to war against the English-Roman alliance, had themselves painted in a light shade of blue. It's possible there is a connection with Sirius in that context.
Below are a bunch of photos showing various indigenous peoples smarting the colours red and blue.
(This photo appeared on BBC on March 13th 2009, the men are fighters in West Papua)
(Dancers on the Polynesian island of Niue at the Pasifika festival, with faces painted blue - wikipedia)
(Screenshot of a Kayapo man from the documentary Baraka, which shows loads of T1 and T2 Earth peoples)
(Another screenshot from the documentary Baraka of a Kayapo Indian – Brazilian Amazon)
(An Egyptian Pharoah, showing a Sirian-Blue human. It is said that some Nubians have a bluish hue to their dark appearance. Blue humans are also shown among Vedic deities. This usually have connections with the Sirian and/or Centaurian star systems)
(Photo from wikipedia showing various Native Indian people)