Blood was a liquid substance present in most sentient beings, though not all species had the same color of blood. Humans and Aqualish, for example, had red blood; while Rodians, Duros, and Trandoshans had green blood. Kiffar had scarlet blood. By testing a sample of someone's blood, it was possible to get a midi-chlorian count and determine how sensitive one was to the Force. Human blood was said to have a characteristic metallic taste.