Eleanora Eden on tue 13 mar 07
I always steered clear of neph sy because of the stick-to-the-bottom-
of-the-bucket issue. Now I am cautiously using it as it is such a good
flux for the ^3 glaze range. Am finding that 20% works okay. Anybody
else have a ball park figure for using this problematic ingredient?
Eleanora
>One thing that does help with glazes that do this is to mix about
>0.5% soda ash in with the water before you mix the glaze. It helps
>to heat the water to get it to dissolve. It doesn't work nearly as
>well to add the soda ash after you've mixed the glaze with the
>water. This doesn't completely fix the problem, but it helps.
>You're right that the best solution would be reformulating the
>recipe. Remember that you don't have to get rid of all the Neph Sy
>to make the problem at least manageable. But you should be able to
>replace at least half of it with frits and such.
>Happy testing.
>Paul Lewing
www.paullewingtile.com
--
Bellows Falls Vermont
www.eleanoraeden.com
Paul Herman on tue 13 mar 07
Eleanora,
It will help if you add a little flocculant to the glaze mix. I use
epsom salt at 1/2%.
Nepheline syenite releases a lot of alkali to the glaze slop, causing
deflocculation, and it needs to be counter balanced.
best,
Paul Herman
Great Basin Pottery
Doyle, California US
http://greatbasinpottery.com
On Mar 13, 2007, at 9:44 AM, Eleanora Eden wrote:
> I always steered clear of neph sy because of the stick-to-the-bottom-
> of-the-bucket issue. Now I am cautiously using it as it is such a
> good
> flux for the ^3 glaze range. Am finding that 20% works okay. Anybody
> else have a ball park figure for using this problematic ingredient?
>
> Eleanora
>
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