You used one offhand reference in wikipedia as your source...
Even though every other statement disagrees.
The correct answer is Ichor (n.) :
1. Classical Mythology. an ethereal fluid flowing in the veins of the gods.
2. Military. Nondescript blood and gore
3. Literature. Alternate term for blood, esp. of non-human beings
Ichor = dark/blackish red
Think arterial blood.