When their faces have been blackened by the smoke: The reference is to the residue of soot from the lamps burning in the temple. Contemporary English Version makes this active by saying “when the smoke in the temple makes their faces black.”

Quoted with permission from Bullard, Roger A. and Hatton, Howard A. A Handbook on The Shorter Books of the Deuterocanon. (UBS Helps for Translators). New York: UBS, 2006. For this and other handbooks for translators see here.