Made of animal bones. As the organic components of the bone carbonize, the resulting carbon particles become embedded within the inorganic bone matrix. Particle size 50 – 300µm Chemical description: Pigment Black 9, C.I. 77267 Lightfastness - thinned: 8 (1 is bad, 8 is best) Lightfastness - medium: 8 (1 is bad, 8 is best) Lightfastness - concentrated: 8 (1 is bad, 8 is best) ColorIndex: PBk 9.77267 Suitability: Acrylics, Lime / Fresco, Oil, Tempera, Watercolor / Gouache Colors: Black Forms: powder Solubility in water: insoluble Chemical and Physical Properties Coloring strength: (gegen Laborstandard) 95 – 100 % DIN 55986-A (modified, test method LALPA001) pH-Value: 9.0 – 11.0 DIN EN ISO 787/9 Volatile components (at 105°C) ≤ 2 % DIN EN ISO 787/2 (modified, test method LABPA006) Oil value: 60 ± 10 ml/100 g DIN EN ISO 787/5 (modified, test method LABPA020)
