slate black

The slit of blood grew larger and larger in the slate-black clouds.

The rocking floor of the sea, blue and gray and slate black by turn, spread to the east.

They bathed it in reddish light, and it loomed halfway out of the slate-black sea like something left alone in a ruined world.

Wings and tail slate-black edged chiefly with bluish plumbeous gray, the coverts and tertiaries with olive-green.