realgar
/riˈælɡɑr/
noun
- A soft, bright red or orange mineral made of arsenic and sulfur, sometimes used as a pigment or in fireworks.
- Firework makers once used realgar to produce a bright orange color in their displays.
- Ancient artists ground realgar into a powder to create a vivid red paint for their murals.
- The museum displayed a sample of realgar from a Chinese mine, noting its toxic properties.