ok. So Blood Caste = Confirmed

Color Hierarchy = Confirmed

But yellow is lowest? Is it because he really doesn’t remember in his fit of anger, or is their caste system really crazy.

but it still supports my theory of Red = WORSE/ Purple = BEST.

So at the moment, Sollux is confirmed to be the lowest caste of the Trolls. I am thinking that Karkat has red blood, because that would explain his anger issues with an inferiority complex

(oh shit humans have red blood, some ass-troll as going to be soo pissed with ‘low-caste’ humans come around)