Umber
Umber is a natural mineral known for its brown powder form and is insoluble in water. It contains quartz, which is a known human carcinogen, and is used as a body stain in ceramics.
- Material class: colorant
- Glaze role: colorant
Oxide Analysis (wt%)
| Oxide | wt% |
|---|---|
| Fe₂O₃ | 47.75 |
| MnO | 18.20 |
| SiO₂ | 12.39 |
| LOI | 12.28 |
| CaO | 4.70 |
| Al₂O₃ | 2.74 |
| MgO | 1.93 |
Safety
- H226: Flammable liquid and vapour
- H335: May cause respiratory irritation
- H336: May cause drowsiness or dizziness
- H340: May cause genetic defects
- H350: May cause cancer
- H319: Causes serious eye irritation
- H372: Causes damage to organs through prolonged or repeated exposure
- H226: Flammable liquid and vapour
- H335: May cause respiratory irritation
- H336: May cause drowsiness or dizziness
- H340: May cause genetic defects
- H350: May cause cancer
- H319: Causes serious eye irritation
- H372: Causes damage to organs through prolonged or repeated exposure