Nickel Oxide NiO, NiO2, Ni2O3, and Ni3O4
- Strong colorant that melts at 3614°F
- Used to produce browns, grays, blues, yellows, and pinks
- Often used in crystalline glazes for blue crystals
- Used in black glazes and stains for strong black colors
- Above 2192°F nickel becomes unstable, fluxing glaze, and can form scum on glassy glazes during cooling
- Material is very difficult to use at cone 10 without running
- Use with great caution
- Very toxic
- Becomes volatile at higher temps, creating toxic fumes
- Sources are black (Ni2O3) and green nickel oxide (NiO).