Karen Sullivan on mon 23 apr 01
Liz...
would it be possible to inquire about
Malcolm's No. 2 glaze...and are there more???
I would love the formula if possible...
bamboo karen
on 4/23/01 3:45 PM, Liz Willoughby at lizwill@PHC.IGS.NET wrote:
> Dear Marj,
>
> Just thought that I would add a little here regarding shino used on teapots.
> I've made a lot of teapots using shino, and have used one or two of
> them often in my kitchen over the past few years. It is a shino with
> high soda ash, Malcolms #2 in fact, and I replaced half the EPK with
> alumina. Porcelain fired to cone 10/11 R, and it is probably close
> to 0 absorbancy. Never had any problems. I almost always test my
> teapots too, after firing, with boiling water, with no heat up at
> with warm water.
>
> There are some crazing lines inside the teapots that I use, those
> lines are dark brown from the tea, but it doesn't really concern me
> if the clay is or almost, vitreous.
>
> I might be concerned using a cone 6 clay that usually isn't vitreous
> after glaze firing.
>
> Another point is that if you used a liner glaze when glazing the
> outside with a carbon trap shino glaze, you are not going to get
> great results with the carbon trapping because the salts on the
> inside travel through the clay body to deposit more salts. Also
> every shino is different, much depends on the recipe. Shino is a
> glaze type (Ha! Maple leaf shino is not a bad name for a Canuck Shino
> Mel), so maybe when we talk about it we should specify.
>
> Love all this shino stuff.
>
> Liz
>
>
>
>>
>>
>> Part of my concern is the shino is a stiff/matt glaze under that glorius
>> surface and if a teapot, for example, was used on a regular basis and the
>> body was not tight and the glaze crazed ,the moisture would swell the pot
>> and you end up with a pot that oozes tea and has lost its integrity/strength
>> and would sound like a cardboard box instead of a pot if you tapped it.
>>
>> Therefore my questions about how tight a body should be and if a liner glaze
>> would be a good choice. Which leads to the question - How much of a
>> difference in expansion of glazes can be used together on one pot. Insight
>> 8plus on outside - Insight 6.5 - 7.0 on the inside ? Yes, I plan to test
>> all this but was hoping someone could steer me in the right direction so I
>> do not wander off track too far. MarjB
>>
>>
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>
> Liz Willoughby
> RR 1
> 2903 Shelter Valley Rd.
> Grafton, On.
> Canada
> K0K 2G0
> e-mail lizwill@phc.igs.net
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
> melpots@pclink.com.
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