nigrescent

adj

1. Approaching blackness; blackish, dark-coloured.

   “Pomp of Words Moſt ſplendidly nigrescent”

   “At night the temperature is 250 degrees below zero; by day it is the heat of boiling water. Yet the sun is but an intense circle of white aloft in a nigrescent sky.”

   “[T]he dark death roses came into bloom. I cut them and carried them to Thecla, nigrescent purple flecked with scarlet.”