Nickel oxide (NiO)
Nickel oxide is a versatile colorant in ceramics, valued for its ability to produce a wide range of colors, including gray, green and brown tones in glazes and engobes. Although not as popular as other metal oxides, such as cobalt or iron, nickel oxide offers a unique and subtle palette that is especially attractive in experimental and decorative glazes.
One of its outstanding characteristics is its ability to change color depending on firing conditions and the composition of the mixture in which it is used. In oxidized firing atmospheres, nickel oxide can create cool grays or pale greens, while in reduced atmospheres or in combination with other components, it can generate deep browns and warm greens, adding complexity and visual richness to pieces.
It is known to be a "mysterious" or "whimsical" colorant, as its results can vary markedly with even slight changes in firing atmosphere or glaze composition, allowing ceramists to play with its effects and discover unique shades.Interesting Fact
In addition to its applications in ceramics, it is used in other fields to create color effects. In glass manufacturing, for example, nickel oxide can generate shades ranging from violet to gray, depending on concentration and production conditions.Helpful Tip
Use nickel oxide in low concentrations, as it can be toxic. Be sure to handle with care and work in a well-ventilated area, using gloves and appropriate protective equipment.
