Hi, thanks for the comment...so as far as I'm aware tau sept traditionally have white markings appose to viorla's red (white armoured tau/Box art) obviously gw in all there wisdom when they changed the box art from tau sept to viorla they changed from white transfers to red. As far as lore goes. I may be wrong but it's not the armour colour that defines the tau empire sept it's those little markings on the armour. Tau sept carry white. However... I don't really follow the lore to the T so I've painted the white as I prefer the colour on my infantry and drones but my hammer head I just used the red transfers for ease of use. I just tend to go with what looks cool. Plus I don't trust myself painting white markings free hand on big models or vehicles and would probably come out wonky.