Cadmium Red Dark is an inorganic synthetic mineral pigment. Invented in the nineteenth century, this color is a cadmium sulphide which can be obtained with two methods: Starting from cadmium nitrate from which the carbonate is precipitated with Solvay soda and heated with sulfur flowers; From cadmium sulphate with sodium sulphide.
This pigment has a shade that can vary from light orange to purple and has a high covering power. It is incompatible with lead-based paints, but is soluble in sulfuric and nitric acids and can be falsified with solid azos.
Advice for use: It can be used in tempera and oil, while we do not recommend using it for fresco and encaustic.
- Inorganic mineral pigment
- Incompatible with lead-based paints
- Soluble in sulfuric and nitric acid
- Used in tempera and oil, not recommended for fresco and encaustic
- Toxicity: Toxic
- Covering power: high
- Coloring power: medium-high
- Opacity: High
- Humidity stability: medium high
- Thinner amount: high