cookie davis on tue 16 apr 02
Hello All!
This goes out to anyone who wants to reply. I was looking up today clay
body recipes in Chappel's book, and I found a Tan s.w. throwing body, which
fires from cone 8-10. here is the recipe in the book:
60 Kaiser fire clay
20 Ken. Ball om4
20 Redart
Question #1: does this look like a "good" claybody recipe
Question #2: What is Kaiser Fire Clay? Is it still around and if not, what
would be a good substitute???
Thanks in advance to those who answer-your time and help is appreciated,
Sincerely,
Cookie
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Edouard Bastarache on tue 16 apr 02
Hello cookie,
I used it as a starting point for a brown clay:
Goldart 60%
Bell dark ball clay 20
Redart 20%
Grog (30 mesh) 5%
It worked ok, it fired a nice medium brown.
Later,
Edouard Bastarache
Irreductible Quebecois
Indomitable Quebeker
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
http://sorel-tracy.qc.ca/~edouardb/
http://perso.wanadoo.fr/smart2000/index.htm
Working Potter on wed 17 apr 02
WHAT CONE............
> Hello cookie,
>
> I used it as a starting point for a brown clay:
>
> Goldart 60%
> Bell dark ball clay 20
> Redart 20%
>
> Grog (30 mesh) 5%
>
> It worked ok, it fired a nice medium brown.
> Later,
> Edouard Bastarache
>
Ron Roy on sat 27 apr 02
Dear Cookie,
This is the kind of body I had to use when I first went to art college - I
did hundreds of glaze tests trying to fit glazes to it - the most common
problem was shivering - thats because there was so much cristobalite being
formed.
It is a bad cone 10 body because it is short of KNaO (sodium and potassium
oxides) which are needed to combat cristobalite. I would expect problems at
cone 8 as well. Don't expect clays labeled 8 to 10 to work well at both
temperatures - you are asking the impossible.
The 2nd problem is the amount of fire clay. Fire clays vary from batch to
batch - having that much means the body will be affected by swings in the
fire clay. OM#4 is not the most stable clay either - not to mention Red Art
- which varies a lot.
No - look for a body with many different clays - the more the better. Try
to keep any clay - preferably one of the more reliable - to no more the
30%.
Clay body formulation is better the more complex it is - more stable in the
long run and easier to adjust when needed.
RR - only 10 days behind - which means I am catching up.
>This goes out to anyone who wants to reply. I was looking up today clay
>body recipes in Chappel's book, and I found a Tan s.w. throwing body, which
>fires from cone 8-10. here is the recipe in the book:
>
>60 Kaiser fire clay
>20 Ken. Ball om4
>20 Redart
>
>Question #1: does this look like a "good" claybody recipe
>Question #2: What is Kaiser Fire Clay? Is it still around and if not,
what
>would be a good substitute???
>
>Thanks in advance to those who answer-your time and help is appreciated,
>
>Sincerely,
>Cookie
Ron Roy
RR #4
15084 Little Lake Road
Brighton
Ontario
Canada - K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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