In the Warhammer 40k novel Crisis of Faith by Phil Kelly, O'Shoh (aka Commander Farsight), the main character, is asked why he painted his battlesuit red. He replies, "It is to honour the Arkunashan dead. Their blood is on my hands, and I will not forget it." (The Arkunashan dead are fallen Tau soldiers.)
Under this assumption, red would be an appropriate color for a human who is seeking to avenge his fallen comrades, but according to the Tau Codex, Tau Lexicanum, and RPG-SE, Tau blood is actually blue. Meaning that Farsight's hands were (figuratively speaking) stained with blue blood.
Why is it then that he paints his modified Crisis Battlesuit in red, and not blue. Do any of the Warhammer 40k supplements or general lore explain this discrepancy, or is this just an honest mistake? Note that GW depicts Commander Farsight in a red Crisis Suit.
For now I'm assuming its an honest oversight of the novel. Still, I haven't been able to find a single reference to why Farsight and his enclave wear red. According to the Tau Lexicon, the fire caste wars armour the same color as their sept's (home/main planet's) surface. But I don't believe all septs in the Farsight enclave are red. Fluff/lore -wise, there must be something behind it. Or did GW just choose red at random?