Red and blue 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, and specifically it indicates specific indigenous races on Earth that are connected with the Guardians from both systems. Often you find that some native peoples use both red and blue in their ritual dances or ceremonies.
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, they had themselves painted in a light shade of blue. There is a connection with Pleiades and Sirius in that context.
Below are some photos showing various indigenous peoples smarting the colours red and blue.
The Rainbow and the Kings: A History of the Luba Empire to 1891 [Google scholar][WorldCat]
Smiths, Shamans and Mystagogues [JSTOR][Google scholar]
Le renard pâle [Google scholar]
Crow‐type skewing In Akan kinship vocabulary and Its absence In Minangkabau [Google scholar]