Orpiment has been used as a pigment since ancient times. It was used in China to make a yellow paint called “King’s yellow.” Orpiment was also used in Europe to make paints and cosmetics. However, orpiment is a toxic mineral, and exposure to it can cause serious health problems, including cancer, skin irritation, and respiratory problems.

Here are some of the physical and chemical properties of yellow arsenic sulphide:

• Formula: As2S3
• Color: Bright yellow
• Luster: Adamantine
• Hardness: Mohs hardness of 1.5-2
• Density: 3.46 g/cm³
• Solubilities: Insoluble in water, slightly soluble in hydrochloric acid and nitric acid
• Melting point: 330°C
• Boiling point: 707°C

Orpiment is a rare mineral that is found in only a few places in the world. It is considered to be a hazardous material, and its use as a pigment is no longer common. However, orpiment is still used in some industrial applications, such as the manufacture of fireworks and glass.