Realgar is a natural orange-red arsenic sulfide. It is chemically closely related to orpiment. These two minerals are often found in the same deposits. Undesirable reactions with white lead and red lead are possible.

•Chemical description: Arsenic sulfide, natural mineral.

• Chemical formula: As4S4

•ColorIndex no data

• Lightfastness 6.7

• Suitability Acrylic, Tempera, Watercolor / Gouache

• Color bright orange

• Powder form

•Alkali resistance:5

• Lime resistance: 5

• Acid resistance: 5

• Hiding power is high