June Perry on tue 7 oct 03
Ron,
What limits do you use for cone 6 copper bearing glazes? The limits in the
recipe posted, which you said were too high for cone 6, seem to be within
Insights limits for a cone 6 copper bearing glaze, or am I not reading the chart
properly?????
Thanks!
June Perry
http://www.angelfire.com/art2/shambhalapottery
Ron Roy on thu 9 oct 03
John and I have established a different set of limits - for
durability/stability based on the testing we did for our book - not carved
in stone but reliable guide lines if what you are looking for is stability.
Insight limits are certainly not for stability although better than
nothing. There is no mention of limits for copper glazes that I know of.
The different limits we were all using before we did the testing for cone 6
were for melt rather than stability - we could not find any research done
on cone 6 glazes and leaching.
Copper is a special case - as it was for lead glazes. It promotes leaching
more than any other oxide added to a glaze. We were surprised to find that
so - but it is.
There are 4 main "rules" for making stable glazes - as we have outlined in
our book - getting the glaze to melt well is one of them. The recipe posted
was high in alumina and not high in boron - factors I believe could result
in a glaze not being well melted. I cannot be sure so I did say - may not
be stable.
RR
>Ron,
>
>What limits do you use for cone 6 copper bearing glazes? The limits in the
>recipe posted, which you said were too high for cone 6, seem to be within
>Insights limits for a cone 6 copper bearing glaze, or am I not reading the
>chart
>properly?????
>
>
>Thanks!
>June Perry
>http://www.angelfire.com/art2/shambhalapottery
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Jennifer Boyer on thu 9 oct 03
Ron:
Have you come up with your own set of limits for Cone 10?
Just wondering
Jennifer
On Thursday, October 9, 2003, at 01:29 AM, Ron Roy wrote:
> John and I have established a different set of limits - for
> durability/stability based on the testing we did for our book - not
> carved
> in stone but reliable guide lines if what you are looking for is
> stability.
>
> Insight limits are certainly not for stability although better than
> nothing. There is no mention of limits for copper glazes that I know
> of.
>
> The different limits we were all using before we did the testing for
> cone 6
> were for melt rather than stability - we could not find any research
> done
> on cone 6 glazes and leaching.
>
> Copper is a special case - as it was for lead glazes. It promotes
> leaching
> more than any other oxide added to a glaze. We were surprised to find
> that
> so - but it is.
>
> There are 4 main "rules" for making stable glazes - as we have
> outlined in
> our book - getting the glaze to melt well is one of them. The recipe
> posted
> was high in alumina and not high in boron - factors I believe could
> result
> in a glaze not being well melted. I cannot be sure so I did say - may
> not
> be stable.
>
> RR
>
>
>> Ron,
>>
>> What limits do you use for cone 6 copper bearing glazes? The limits
>> in the
>> recipe posted, which you said were too high for cone 6, seem to be
>> within
>> Insights limits for a cone 6 copper bearing glaze, or am I not
>> reading the
>> chart
>> properly?????
>>
>>
>> Thanks!
>> June Perry
>> http://www.angelfire.com/art2/shambhalapottery
>
> Ron Roy
> RR#4
> 15084 Little Lake Road
> Brighton, Ontario
> Canada
> K0K 1H0
> Phone: 613-475-9544
> Fax: 613-475-3513
>
> _______________________________________________________________________
> _______
> 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.
>
>
***********************************************
never pass on virus warnings or emails with checking them at:
http://snopes.com
Jennifer Boyer - Thistle Hill Pottery
Montpelier, VT 05602
http://thistlehillpottery.com
***********************************************
Ron Roy on fri 10 oct 03
Hi Jennifer,
Not yet - but we will.
John suspects they will be close to the cone six limits based on the
experiments he has done - I have to so some of the work here in my gas
kiln.
RR
>Have you come up with your own set of limits for Cone 10?
>Just wondering
>Jennifer
>On Thursday, October 9, 2003, at 01:29 AM, Ron Roy wrote:
>
>> John and I have established a different set of limits - for
>> durability/stability based on the testing we did for our book - not
>> carved
>> in stone but reliable guide lines if what you are looking for is
>> stability.
>>
>> Insight limits are certainly not for stability although better than
>> nothing. There is no mention of limits for copper glazes that I know
>> of.
>>
>> The different limits we were all using before we did the testing for
>> cone 6
>> were for melt rather than stability - we could not find any research
>> done
>> on cone 6 glazes and leaching.
>>
>> Copper is a special case - as it was for lead glazes. It promotes
>> leaching
>> more than any other oxide added to a glaze. We were surprised to find
>> that
>> so - but it is.
>>
>> There are 4 main "rules" for making stable glazes - as we have
>> outlined in
>> our book - getting the glaze to melt well is one of them. The recipe
>> posted
>> was high in alumina and not high in boron - factors I believe could
>> result
>> in a glaze not being well melted. I cannot be sure so I did say - may
>> not
>> be stable.
>>
>> RR
>>
>>
>>> Ron,
>>>
>>> What limits do you use for cone 6 copper bearing glazes? The limits
>>> in the
>>> recipe posted, which you said were too high for cone 6, seem to be
>>> within
>>> Insights limits for a cone 6 copper bearing glaze, or am I not
>>> reading the
>>> chart
>>> properly?????
>>>
>>>
>>> Thanks!
>>> June Perry
>>> http://www.angelfire.com/art2/shambhalapottery
>>
>> Ron Roy
>> RR#4
>> 15084 Little Lake Road
>> Brighton, Ontario
>> Canada
>> K0K 1H0
>> Phone: 613-475-9544
>> Fax: 613-475-3513
>>
>> _______________________________________________________________________
>> _______
>> 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.
>>
>>
>***********************************************
>never pass on virus warnings or emails with checking them at:
>http://snopes.com
>
>Jennifer Boyer - Thistle Hill Pottery
>Montpelier, VT 05602
>http://thistlehillpottery.com
>***********************************************
>
>______________________________________________________________________________
>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.
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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