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GLOSSARY

Alkali

Alkali is in general terms referring to any 'basic' substance i.e. any material with a pH greater than 7, as opposed to 'acids'.

In ceramic contexts 'alkali' usually refers to hydroxides and carbonates of sodium and potassium. Alkalis act as fluxes in ceramics and glass production-enabling silica to melt at lower temperatures.

Alkali materials, such as sodium and potassium compounds, are used in ceramics for various purposes, mainly in the formation of glazes and the modification of clay bodies. They play a multifunctional role in ceramics, influencing the physical, chemical, and aesthetic properties of the final products. Their careful selection and proportioning are essential for achieving the desired characteristics in ceramic pieces, whether they are artistic or functional.

Here is a breakdown of their uses:

1. Formation of Glazes:

2. Modification of Clay Bodies:

3. Color and Aesthetics:

4. Chemical Stability:

5. Glass Formation:

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