Electric Mid&Hi Fired Ceramics
Colemanite and spodumene in glazes
Hallo,
Is there anyone who can give me some advice on using colemanite and spodumene in glazes?
I have read that use of colemanite can cause some problem in glaze if colemanite is present in big concentration (decrepitation). What can be the maximum concentration that give not big problems? 10%?
If my firing is slow is it possible that this problem will be less?
About spodumene: I have seen that can be better to wash it and that big concentration can determine some "wave" In the glaze. Is this problem bigger in single firing? Someone know why it is better to wash spodumene?
Many thanks
Luca
Norm Stuart
Become familiar with Digitalfire, a great source for most ceramic chemistry answers.
https://digitalfire.com/material/colemanite
https://digitalfire.com/material/spodumene
Small batches of glaze and test tiles are your best friend when developing new glazes.
I always fire a tile of high fire glaze at bisque temperature as well so I can see what's happening to the glaze as the firing proceeds.
Mar 6, 2021