'White' in the Bible

I have seen by night, and lo, one riding on a red horse, and he is standing between the myrtles that are in the shade, and behind him are horses, red, bay, and white.

and in the third chariot white horses, and in the fourth chariot strong grisled horses.

The brown horses that are therein, are coming forth unto the land of the north; and the white have come forth unto their hinder part; and the grisled have come forth unto the land of the south;