Wiktionary
black tar
n. An illicit drug formed from the incomplete acetylation of morphine, containing a variable percentage of heroin.
Usage examples of "black tar".
Ground shifted beneath her feet, and suddenly the cavern was below her, its entrance a vast hole blasted into sea ice, an ocean of black tar rolling beneath.
Rather than thinning and being dispelled, as night ought to be by the rising sun, it drew in on itself, lying bare yard by yard the countryside, as though one could make thick black tar flow uphill.
Whandall could see its ripple and gleam: water covering black tar, a death trap shining in the sun.
The prairie cracked in a hundred places to ooze foul black tar that bubbled and boiled.
But even beneath the thick black tar, the shapes were recognizable.