Paul Herman on fri 6 feb 04
Hi Connie,
I don't know if there's a way to prevent it, as I haven't had the
problem. Some of my glazes do use soda ash, but I've never had bloating
that could be traced to that. I have had bloating in a commercially
prepared clay, but cured it by raising the bisque firing from ^010 to
^06.
This whole discussion is a bit futile, as the clay suppliers won't tell
you WHAT is in their clay. Secret formulas, you know? I believe some
organic polymers are used to increase plasticity, particularly in
porcelains.
This secrecy is one of the reasons I make my own clay. Dependant
ignorance was never appealing.
Good mixing,
Paul Herman
Great Basin Pottery
Doyle, California US
http://www.greatbasinpottery.com/
----------
>From: Connie Christensen
>To: CLAYART@LSV.CERAMICS.ORG
>Subject: Re: clay additives/recycled clay
>Date: Wed, Feb 4, 2004, 3:07 PM
>
> Yes, the shino recipe has soda ash in it. Is there a way to prevent the
> bloating from the soda ash if this is the problem? I also have another minor
> problem with the shino in a specific part of the kiln but I want to get one
> more firing in before describing it.
>
> ----- Original Message -----
>
>> Hello Connie,
>>
>> Does the offending shino have soda ash in it? If so, perhaps that could
>> be the cause, soda ash penetrating the body.
>>
>> best wishes,
>>
>> Paul
| |
|
