Bengal light

Once or twice in the course of every Roman winter the Coliseum is illuminated with Bengal lights.

Bengal light, a firework containing niter, sulphur, and antimony, and producing a sustained and vivid colored light, used in making signals and in pyrotechnics; Ð called also blue light.

He studied it from every point and in every light—at sunrise and sunset, and by moonlight, and even had Bengal lights hung at night to bring out new lights and shadows.

And we had recitations besides, and singing, and Bengal lights, which the fairest of moons put to shame.

Take these, they are Bengal lights—some of the fireworks that Tig bought in Red Butte for the Fourth.