David Beumee on fri 27 jun 03
Some weeks ago I asked for advice from Ron about possibility
of cadmium leaching using Ferro 239416 Yellow in a cone 11
base glaze that gets fired in reduction. At the advice of Ron and
Jon's cone 6 book, I used Brandywine Science Center in
Pennsylvania to do the testing. The concentration of inclusion
stain in the base is 12%, and analysis results showed less than
0.01 mg/L cadmium release, well under the 0.5 mg/L maximum
leaching level set by the FDA for "small hollowware." Please
note that this result is in a base glaze that does not craze over
the particular porcelain body that I use.
The result means that alot of aesthetic cosiderations
of yellow color hue are now possible. For me, one third of the
primary color pallette has been missing until now.
David Beumee
Earth Alchemy Pottery
Lafayette, CO
Ron Roy on mon 30 jun 03
Hi David,
Any chance you would be willing to share the recipe of that glaze. We could
all learn something about the durability of cone 10 glazes if you would.
RR
>Some weeks ago I asked for advice from Ron about possibility
>of cadmium leaching using Ferro 239416 Yellow in a cone 11
>base glaze that gets fired in reduction. At the advice of Ron and
>Jon's cone 6 book, I used Brandywine Science Center in
>Pennsylvania to do the testing. The concentration of inclusion
>stain in the base is 12%, and analysis results showed less than
>0.01 mg/L cadmium release, well under the 0.5 mg/L maximum
>leaching level set by the FDA for "small hollowware." Please
>note that this result is in a base glaze that does not craze over
>the particular porcelain body that I use.
> The result means that alot of aesthetic cosiderations
>of yellow color hue are now possible. For me, one third of the
>primary color pallette has been missing until now.
>
>David Beumee
>Earth Alchemy Pottery
>Lafayette, CO
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
David Beumee on sun 27 jul 03
Did you get the recipe? I'll be happy to do a repost.
Would like to learn more about durability of cone 10
glazes myself.
David Beumee
Earth Alchemy Pottery
Lafayette, CO
6/30/03 10:32:38 AM, Ron Roy wrote:
>Hi David,
>
>Any chance you would be willing to share the recipe of that glaze. We could
>all learn something about the durability of cone 10 glazes if you would.
>
>RR
>
>>Some weeks ago I asked for advice from Ron about possibility
>>of cadmium leaching using Ferro 239416 Yellow in a cone 11
>>base glaze that gets fired in reduction. At the advice of Ron and
>>Jon's cone 6 book, I used Brandywine Science Center in
>>Pennsylvania to do the testing. The concentration of inclusion
>>stain in the base is 12%, and analysis results showed less than
>>0.01 mg/L cadmium release, well under the 0.5 mg/L maximum
>>leaching level set by the FDA for "small hollowware." Please
>>note that this result is in a base glaze that does not craze over
>>the particular porcelain body that I use.
>> The result means that alot of aesthetic cosiderations
>>of yellow color hue are now possible. For me, one third of the
>>primary color pallette has been missing until now.
>>
>>David Beumee
>>Earth Alchemy Pottery
>>Lafayette, CO
>
>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.
>
| |
|
