Jessa Lale on wed 24 mar 04
My name is Jessa Lale and I am a Senior at Alpena High School. My science
fair project this year involves replacing Arkansas native clays for the
ball clay Old Mine 4. I am looking for potters who use Old Mine 4 in their
clay recipe and have been having trouble with pinholing. I am trying to
describe how widespread this problem may be. If you possibly know of anyone
who has had this problem I would love to know. I would greatly appreciate
your help.
Thanks again
Jessa Lale
barblund on thu 25 mar 04
With what did you replace the OM #4 ball clay ?
Barb
>
> I replaced OM4 in all of my glazes and two clay suppliers (one in Texas,
> one in Michigan) also replaced the OM4 in the clay because of pinholing.
>
> Kathi
>
> >
.
Kathi LeSueur on thu 25 mar 04
bahai@ERITTER.NET wrote:
>My name is Jessa Lale and I am a Senior at Alpena High School. My science
>fair project this year involves replacing Arkansas native clays for the
>ball clay Old Mine 4. I am looking for potters who use Old Mine 4 in their
>clay recipe and have been having trouble with pinholing. >>
>
I replaced OM4 in all of my glazes and two clay suppliers (one in Texas,
one in Michigan) also replaced the OM4 in the clay because of pinholing.
Kathi
>
>
Ron Roy on fri 26 mar 04
Hi Jessa,
I don't think the OM#4 is the problem - it could be your bisque firing,
glaze firing and/or the glaze itself.
First make sure your bisque firing is slow enough from 700C up and there is
plenty of oxygen present to help burn out the impurities in your clay body.
If refiring still produces pinholes it's probably the bisque firing - if
they go away in a refire it's the glaze or the glaze firing. Try a soak at
the end or reform your glaze to melt more.
RR
>My name is Jessa Lale and I am a Senior at Alpena High School. My science
>fair project this year involves replacing Arkansas native clays for the
>ball clay Old Mine 4. I am looking for potters who use Old Mine 4 in their
>clay recipe and have been having trouble with pinholing. I am trying to
>describe how widespread this problem may be. If you possibly know of anyone
>who has had this problem I would love to know. I would greatly appreciate
>your help.
>Thanks again
>Jessa Lale
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Kathi LeSueur on fri 26 mar 04
larapottery@COMCAST.NET wrote:
>Kathi,
>Did this solve the "glaze mystery" pinhole problem you
>were experiencing a few months ago?
>Cheryl
>
>
yes. I haven't had a problem since. If you are still getting your clay
from Armadillo tell him you want the new formula. He also told me there
is no Plastic Vitrox in any of his clays. Doesn't know where that came
from. You might see a slight shift in color.
kathi
Cheryl Lara on fri 26 mar 04
> yes. I haven't had a problem since. If you are still getting your clay
> from Armadillo tell him you want the new formula. He also told me there
> is no Plastic Vitrox in any of his clays. Doesn't know where that came
> from. You might see a slight shift in color.
>
> kathi
I haven't either, but I felt it was due to my firing about a cone lower.
Must be
getting the new formula - have seen a shift in color, but no pinholing now.
Thanks, Cheryl
>
>
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Cheryl Lara on fri 26 mar 04
Kathi,
Did this solve the "glaze mystery" pinhole problem you
were experiencing a few months ago?
Cheryl
> I replaced OM4 in all of my glazes and two clay suppliers (one in Texas,
> one in Michigan) also replaced the OM4 in the clay because of pinholing.
>
> Kathi
>
> >
> >
>
>
____________________________________________________________________________
__
> 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.
>
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