Bryan Hannis on tue 24 nov 98
Hi
I'm trying to matte a cone 10 glaze without changing it?? I've tried EPK,
silica, Zircopax to no avail?? and I'm about to try talc, alumina Hydrate,
does anyone have any other ideas????
Bryan Hannis
Deborah L. Blackwell on thu 3 dec 98
Bryan,
Ways to matt a glaze are the additions of clay, whiting, Barium oxide in
excess of about .2 molecular equivalents although barium may not cause
matness in a glaze which is high in B2O3 since this oxide forms a
eutectic with barium, producing a fluid glass
Matness can be introduced by:
1. Underfiring.
2.Increasing the alumina
3.Increasing the calcium oxide or magnesia
4. Increasing the silica to the point where devitrification will occur in
cooling
5.Including barium oxide in the glaze in abounts above about .2 molecular
equivalents.
Have fun.
On Tue, 24 Nov 1998 09:49:51 EST Bryan Hannis
writes:
>----------------------------Original
>message----------------------------
>Hi
>
>I'm trying to matte a cone 10 glaze without changing it?? I've tried
>EPK,
>silica, Zircopax to no avail?? and I'm about to try talc, alumina
>Hydrate,
>does anyone have any other ideas????
>
>Bryan Hannis
>
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