Is Hulk's blood green?

Sometimes. When the Gray Hulk fought Wolverine (Hulk #340), for instance, he could be cut and bled green. But sometimes he's been shown with red blood too. read more

The Hulk ‘s blood is green. Even when the Hulk was different colors he still bled green. read more

The Hulk's blood is green in fact. That is to say, the Green Hulk's is. He might not need oxygen - in truth, no amount of oxygen would be enough to sustain the chemical reactions hypothetically needed to generate the power levels he habitually displays. read more