Natural graphite is ground and processed, e.g. by elutriation or flotation, and then chemically purified. This is how it can contain up to 99% carbon.

• Chemical description: Natural graphite, CAS No. 999999-99-4 (natural occuring substance); EINECS 310-127-6
• 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 10.77265
• Suitability: Acrylics, Lime / Fresco, Oil, Tempera, Watercolor / Gouache
• Colors: Black, Gray, Silver
• Forms: solid
• Solubility in water: < 0.001 g/l (20°C)
• Boiling point: 3750°C (sublimation)

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