And thus I saw the horses in the vision, and them that sat on them, having breastplates of fire, and of jacinth, and brimstone: and the heads of the horses were as the heads of lions; and out of their mouths issued fire and smoke and brimstone.
Thus - as follows.
Of fire - the fiery colour of the breastplates answering to the fire issuing out of their mouths. Of jacinth - of hyacinth colour: answering to our dark-blue iris: their dark-dull-coloured breastplates correspond to the smoke out of their mouths.
Brimstone - sulphur-coloured: answering to the brimstone out of their mouths.