•The secret to cool bodies and glazes is a lot of testing.
•The secret to know what to test is material and chemistry knowledge.
•The secret to learning from testing is documentation.
•The place to test, do the chemistry and document is an account at https://insight-live.com
•The place to get the knowledge is https://digitalfire.com
Alkalies are the strong base fluxing oxides of Na2O and K2O. Feldspars are by far the most common alkali sourcing materials, thus the term 'alkali feldspars'. However frits are also an excellent source and sometimes the only alternative to meet the chemistry requirements (e.g. low alumina and high Na2O). Glazes high in these oxides generally are glossy and bright and have high thermal expansions.
Out Bound Links
Na2O - Sodium Oxide, Soda
K2O - Potassium Oxide
In Bound Links
Ceramic chemistry models fired glazes as constructed of oxides decomposed from the materials in the recipe. Fired properties of glazes (like melting temperature, thermal expansion, surface character, even color) are a product of the oxide makeup (the chemistry). Oxides are grouped in various ways to...
By Tony Hansen