Peter Coates on mon 16 apr 07
>
> Hello
>
> I have a base glaze that I use, I believe came from Peter Beseacher.
>
> Custer feld 40
> Dolomite 20
> EPK 20
> Flint 20
>
> I add 7 % zircopax for a white
>
> This glaze requires a full cone 10 to mature. But there are places
> in the kiln that at time may only be cone 9. I was wondering how to
> lower the maturing temp just a little for cone 9 and cone 10. Could
> i just knock the EPK and Flint down 1 % each and add Custer Feld
> and Dolomite by 1 % ?
>
> Thank you for any advice
> Peter
> Oklahoma City
Matthew Katz on mon 16 apr 07
Just drop the Flint and EPK by 1% each, You may find that if the glazes is
that temperature sensitive you may need to drop them another 1-3% But try 1%
for now. Do not change the Dolomite and Custer, that will change the
appearance of the glaze. As a rule of thumb, I never recommend changing the
fluxes as first resort, Changing the fluxes will change the nature of the
glaze.
Good Luck,
Matt
On 4/16/07, Peter Coates wrote:
>
> >
> > Hello
> >
> > I have a base glaze that I use, I believe came from Peter Beseacher.
> >
> > Custer feld 40
> > Dolomite 20
> > EPK 20
> > Flint 20
> >
> > I add 7 % zircopax for a white
> >
> > This glaze requires a full cone 10 to mature. But there are places
> > in the kiln that at time may only be cone 9. I was wondering how to
> > lower the maturing temp just a little for cone 9 and cone 10. Could
> > i just knock the EPK and Flint down 1 % each and add Custer Feld
> > and Dolomite by 1 % ?
> >
> > Thank you for any advice
> > Peter
> > Oklahoma City
>
>
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--
Matthew Katz
Alfred, NY
Lee Love on mon 16 apr 07
On 4/16/07, Matthew Katz wrote:
> Just drop the Flint and EPK by 1% each, You may find that if the glazes is
> that temperature sensitive you may need to drop them another 1-3% But try 1%
> for now.
I would do a triaxle of the EPK and Silca. Or, a simple lineblend of each.
My teacher's standard ash glaze has different amounts of kaolin
added, from 5% to 25%, depending on which kiln (gas or noborigama) and
what area in the kiln.
--
Lee in Mashiko, Japan
Minneapolis, Minnesota USA
http://potters.blogspot.com/
"To affect the quality of the day, that is the highest of arts." -
Henry David Thoreau
"Let the beauty we love be what we do." - Rumi
Ron Roy on wed 18 apr 07
Hi Peter,
Yes - that will do fine but do a little line blend - less one of each (clay
and silica) and another less 3 of each - after you dip tests mix the two
togetther and you will will see what happens when you lower each by 2.
Problem is your expansion is going to go up so you should look and test for
crazing.
That can be handled another way if it happens.
RR
>> Hello
>>
>> I have a base glaze that I use, I believe came from Peter Beseacher.
>>
>> Custer feld 40
>> Dolomite 20
>> EPK 20
>> Flint 20
>>
>> I add 7 % zircopax for a white
>>
>> This glaze requires a full cone 10 to mature. But there are places
>> in the kiln that at time may only be cone 9. I was wondering how to
>> lower the maturing temp just a little for cone 9 and cone 10. Could
>> i just knock the EPK and Flint down 1 % each and add Custer Feld
>> and Dolomite by 1 % ?
>>
>> Thank you for any advice
>> Peter
>> Oklahoma City
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
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