Norm on fri 16 jan 98
Hey Folks,
I am alittle frustrated at the differing results from the same glaze but
different firings.
I have had some pinholing and don't know why exactly.
Perhaps the glaze is too thick??
Wrong cone temp??
I was also wondering if and how I can soak in an electric kiln (Skutt
1018 - 240) without exceeding cone temp??
Thanks to all who answered previous questions on glaze costs. Quite
selfless of you!!
Norm! 8^o
Ray Carlton on sat 17 jan 98
hi norm ....i have had a long battle with pinholing here and the results of
my research have shown that initially with my celadon the thickness of
glaze application was critical and i cleared it up but the main reason i
found for pinholing in another of my glazes was underfired bisque...i
always had pinholing in my salad bowls it drove me crazy and then i had two
glaze firings where the pinholing was ridiculously bad.. I now had had two
glazes out and all the bowls were lost [refire not possible ruins glaze]i
had noticed on upacking the bisque firing that the bowls were a bit
underdone so i deduced that as the bowls were underdone and pinholing that
it would be reasonable to attribute the underfiring with the
pinholing...so...i decided to rebisque them this time with their glazes on
and after the bisque i would then proceed with the firing to cone 13 ....i
held the kiln for a good 30 minutes at 1000c in a clear oxidising state and
then proceeded with my usual reduction cycle which begins at 1000c...you
guessed it not a pinhole any where...i had always stacked the bowls at the
bottom of a bisque setting and that is where the kiln is coolest ...also a
bit longer in the soak at top temp may help you
At 09:02 16/01/98 EST, you wrote:
>----------------------------Original message----------------------------
>Hey Folks,
>
>I am alittle frustrated at the differing results from the same glaze but
>different firings.
>
>I have had some pinholing and don't know why exactly.
>
>Perhaps the glaze is too thick??
>
>Wrong cone temp??
>
>I was also wondering if and how I can soak in an electric kiln (Skutt
>1018 - 240) without exceeding cone temp??
>
>Thanks to all who answered previous questions on glaze costs. Quite
>selfless of you!!
>
>Norm! 8^o
>
>
cheers :)
Ray Carlton
DONPREY on sat 17 jan 98
Regarding pinholing,
It is probably rare the anybody knows exactly why a glaze pinholed one time
and not another......we usually don't have enough data to be that sure. One
way to soak the kiln load would be to simply turn all switches from high back
to medium when you have reached the witness cone condition you were aiming
for.
Don Prey in Oregon
Hodaka Hasebe on sun 18 jan 98
Hi, norm I had the same pinholing problem due to underbisquing. I use
stoneware clay fire to cone 10. Now I bisque to cone 06 in an electric
kiln, and have not seen much pinhoing since.
hasebeh@eznet.net
At 9:49 AM 1/17/98 -0500, Ray Carlton wrote:
>----------------------------Original message----------------------------
>hi norm ....i have had a long battle with pinholing here and the results of
>my research have shown that initially with my celadon the thickness of
>glaze application was critical and i cleared it up but the main reason i
>found for pinholing in another of my glazes was underfired bisque...i
>always had pinholing in my salad bowls it drove me crazy and then i had two
>glaze firings where the pinholing was ridiculously bad.. I now had had two
>glazes out and all the bowls were lost [refire not possible ruins glaze]i
>had noticed on upacking the bisque firing that the bowls were a bit
>underdone so i deduced that as the bowls were underdone and pinholing that
>it would be reasonable to attribute the underfiring with the
>pinholing...so...i decided to rebisque them this time with their glazes on
>and after the bisque i would then proceed with the firing to cone 13 ....i
>held the kiln for a good 30 minutes at 1000c in a clear oxidising state and
>then proceeded with my usual reduction cycle which begins at 1000c...you
>guessed it not a pinhole any where...i had always stacked the bowls at the
>bottom of a bisque setting and that is where the kiln is coolest ...also a
>bit longer in the soak at top temp may help you
>
>
>At 09:02 16/01/98 EST, you wrote:
>>----------------------------Original message----------------------------
>>Hey Folks,
>>
>>I am alittle frustrated at the differing results from the same glaze but
>>different firings.
>>
>>I have had some pinholing and don't know why exactly.
>>
>>Perhaps the glaze is too thick??
>>
>>Wrong cone temp??
>>
>>I was also wondering if and how I can soak in an electric kiln (Skutt
>>1018 - 240) without exceeding cone temp??
>>
>>Thanks to all who answered previous questions on glaze costs. Quite
>>selfless of you!!
>>
>>Norm! 8^o
>>
>>
>cheers :)
>
>Ray Carlton
>
>
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