Wikipedia
Mercury sulfide
Mercury sulfide, mercuric sulfide, mercury sulphide, or mercury(II) sulfide is a chemical compound composed of the chemical elements mercury and sulfur. It is represented by the chemical formula HgS. It is virtually insoluble in water.
Usage examples of "mercury sulfide".
There was a little pouch of powdered mercury sulfide, which no one in their right mind would give anyone, and a packet of foxglove, which was almost as bad.