'Red' in the Bible

A second horse went out. It was fiery red, and its rider was given permission to take peace away from the earth and to make people slaughter one another. So he was given a large sword.

Then I saw the lamb open the sixth seal. There was a powerful earthquake. The sun turned as black as sackcloth made of hair, and the full moon turned as red as blood.

Then another sign appeared in the sky: a huge red dragon with seven heads, ten horns, and seven royal crowns on its heads.