Eleanora Eden on wed 14 mar 07
Paul,
So you recommend epsom salt and Paul Lewing recommends soda ash
in hot water. Do you, or anybody out there, have experience in which
works better, any downside for either? Do you add the epsom salt to the
water first or as any ingredient to the mix?
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
>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
--
Bellows Falls Vermont
www.eleanoraeden.com
Paul Herman on wed 14 mar 07
Eleanora,
Soda ash is a deflocculant, and would make your settling problem
worse I think. I don't know what Paul Lewing recommended it for, but
it probably wasn't for the same reason. Epsom salt is a flocculant,
which is what you need for the settling.
Yes, I dissolve the epsom salt in warm water, then add the dry
materials.
good glazing,
Paul Herman
Great Basin Pottery
Doyle, California US
http://greatbasinpottery.com
On Mar 14, 2007, at 5:18 AM, Eleanora Eden wrote:
> Paul,
>
> So you recommend epsom salt and Paul Lewing recommends soda ash
> in hot water. Do you, or anybody out there, have experience in which
> works better, any downside for either? Do you add the epsom salt
> to the
> water first or as any ingredient to the mix?
>
> 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
>>
>
>
>
>> 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
>>
>
>
> --
> Bellows Falls Vermont
> www.eleanoraeden.com
>
>
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