Plainsman Clays | NICA
Nickel Carbonate
Nickel Carbonate is a pale green powder, and none of that green survives the firing. It fires grey, brown, purple or yellow depending on the other materials in the glaze, more than on the amount added.
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Nickel Carbonate breaks down to the oxide below about 400°C (750°F), well before a glaze begins to soften, so all of its gas typically has left before anything melts. Nickel takes several forms in a glass at once, and the fluxes present decide which one dominates. A potash glaze tends toward purple, soda and calcium toward brown and grey, and lithium and magnesium toward yellow. Blues and turquoises come from nickel caught in a growing crystal, so they need a crystallising glaze and a slow cool as well as a recipe. Beyond a modest addition the nickel crystallises out and mattes the surface. It is insoluble in water, so it stays evenly mixed in a dipping tank.
- A pale green powder that fires grey, brown, purple or yellow
- All its gas is gone below about 400°C (750°F), well before a glaze softens
- The colour follows the fluxes in the base more than the amount added
- Blues and turquoises need a crystallising glaze and a slow cool
- Insoluble in water, so it stays evenly mixed in a dipping tank
