Potassium carbonate, commonly known as potash, is a compound that acts as a flux, helping to lower the melting point of glazes and facilitating vitrification, especially at medium and low temperatures.
Potash is mainly used in alkaline glazes, where it creates shiny and transparent finishes, standing out for intensifying and saturating colors. In addition, potash contributes to improve the stability of colors during firing, preventing them from altering in the kiln and offering more precise control over the final shade.
In high-temperature ceramics, potassium carbonate can be integrated into ash glazes, where it promotes a unique interaction with other materials in the mixture, such as silica and feldspar, producing smooth melting effects and attractive glazes. It can also be used in combination with other fluxes to adjust the thermal expansion of the glaze, helping to avoid cracking or flaking problems in functional parts.
Interesting Fact
Potassium carbonate has historically been produced from wood ash and is a major component in many traditional glazes.
Helpful Tip
When working with potassium carbonate, be sure to balance it properly with other fluxes to avoid making the glaze too corrosive, which could damage the surface of the ceramic pieces.
