'Black' in the Bible

Neither shalt thou swear by thy head, for thou canst not make one hair white or black.

And when he opened the first seal, I heard the third living creature saying, Come. And I saw, and behold, a black horse; and he that sat thereon had a balance in his hand.

And I saw when he opened the sixth seal, and there was a great earthquake; and the sun became black as sackcloth of hair, and the whole moon became as blood;