A sick feeling spread through my gut as I looked at the dark substance on my hand.

Both were lined with thick layers of some dark substance, evidently similar to rubber.

The lights showed a dark substance curling from the drain hole.

Holding them wrapped in a large leaf, he pointed out some dark brown substance that covered the points.

The old dark sticky substance scraped away from the spot where Townsend had died.

Blood ran down his arms from the wounds where the dark substance had touched him.

While these two were talking, my attention was drawn to a dark metallic substance at the farther end of the room.

The fire came from a thick, dark substance plastered over the stones.

He pressed his hand into the earth and gripped a handful of the dark substance, holding it up for their inspection.

His fingers were sticky with a dark brown substance.