Sentence:  The sun had not yet risen, but the splendour in the East, lighting the sky with wondrous colourings of gold and crimson and green, announced the speedy coming of that god which many of the inhabitants of Baalbek still worshipped. The temples and palaces of the city took their tints from the <WSD>flaming</WSD> sky, and Haziddin, the ambassador, thought he had never seen anything so beautiful, notwithstanding the eulogy Mahomet himself had pronounced upon his own metropolis of Damascus. 
Meaning of the word marked with <WSD> tags:  Very bright and the color of flame.