Calcium nitrate (Ca(NO(NO₃)₂))
Calcium nitrate is a chemical compound used in ceramics mainly as a flux in low-temperature glazes and as an additive in slip. Its ability to lower the melting point of ceramic materials makes it essential in the creation of smooth, glossy and stable glazes, especially in utilitarian or decorative pieces. In addition, its chemical nature allows the creation of reactive effects in glazes, such as speckling or color gradients, which enrich the visual texture of the pieces.
In slip glazes, calcium nitrate acts as a flow modifier, improving workability and reducing the tendency for air bubbles or lumps to form. It also helps minimize shrinkage during drying, which reduces the risk of warping and cracking, especially in large or detailed parts.
Due to its high solubility in water, this compound must be handled with care, as it can react with other ingredients, affecting the stability of the mixture. Its proper use requires precise planning in the proportions and previous tests to ensure a predictable behavior during drying and firing.Interesting Fact
Calcium nitrate is widely known outside the ceramic field for its use in agriculture as a calcium- and nitrogen-rich fertilizer. Its ability to influence root development and improve soil structure makes it a versatile chemical compound that has also found creative applications in ceramics.Helpful Tip
To use calcium nitrate as a flux, perform preliminary tests to determine how it affects the melting of glazes in combination with other materials. If using it in slip, add small amounts and mix well to avoid settling or unexpected chemical reactions. Store it in a dry, sealed place, as it can absorb moisture from the environment and lose effectiveness.
