'Fiery red' in the Bible

And another horse came out--a fiery-red one; and power was given to its rider to take peace from the earth, and to cause men to kill one another; and a great sword was given to him.

Then another sign [of warning] was seen in heaven: behold, a great fiery red dragon (Satan) with seven heads and ten horns, and on his heads were seven royal crowns (diadems).