| Chemistry name: | calcium sulfide, crude |
| Properties: | |
| Yellowish-gray or grayish-white powder; odor of hydrogen sulfide. Soluble in acids; insoluble in water and alcohol. Noncombustible. | |
| Derivation: | |
| By roasting calcium sulfate with coke. | |
| Use: | |
| Medicine, depilatory, luminous paint. | |