Colemanite is a mineral composed mainly of calcium borate that is used in the manufacture of ceramic glazes, mainly as a source of boron. This element is essential as a flux, as it reduces the melting temperature of the glaze, facilitating its application in a wide range of ceramics. In particular, colemanite is especially valued in low-temperature glazes, where its presence allows for more efficient vitrification at lower temperatures.
One of the main advantages of using colemanite in glazes is that it helps to increase the gloss and transparency of finishes. In addition, its ability to reduce the melting temperature also allows for the creation of more versatile glazes, which can be applied to a wider variety of clay types, without the need for extremely high temperatures.
Interesting Fact
Colemanite was discovered in California and is mined mainly from deposits in the United States and Turkey.
Helpful Tip
When formulating low-temperature glazes, consider using colemanite to improve transparency and gloss. However, remember that it is sensitive to moisture, so it should be stored in a cool, dry place to prevent it from absorbing water and degrading.
