Barbara Francis on sun 4 dec 11
--- On Sun, 12/4/11, Barbara Francis wrote:
From: Barbara Francis
Subject: Fw: pinholing
To: "clayart"
Date: Sunday, December 4, 2011, 4:43 PM
I am wondering if there was a problem with this message going through?=3DA0=
T=3D
hanks, Barb Francis
--- On Sun, 12/4/11, Barbara Francis wrote:
From: Barbara Francis
Subject: pinholing
To: "clayart" , "Laurie Dellis" =3D
cglobal.net>
Date: Sunday, December 4, 2011, 1:44 PM
Hi Clayart Potters,
=3DA0
I am a potter in Texas and have been firing Cinco Blanco to Cone 6.=3DA0 I =
ha=3D
ve been bisquing to 05, with a hold, but am experiencing a lot of pinholing=
=3D
and have increased my bisque to 04, I am also firing slowly.=3DA0 I though=
t =3D
that had helped, I had one better firing, and then the pinholing reappeared=
=3D
.=3DA0 I also wiped down the pottery, thinking maybe there was some dust on=
i=3D
t and that was causing the problem.=3DA0=3D20
=3DA0
I talked with a fellow potter yesterday and she is doing the same thing and=
=3D
also having a lot of pinholing.=3DA0 What are we doing wrong?=3DA0 It is a=
cros=3D
s the board with glazes that previously worked.=3DA0=3D20
=3DA0
Could it be the clay?=3DA0 Is anyone else having similar problems with Cinc=
o =3D
Blanco?=3DA0 Could it be the glazes were sitting in a hot garage this summe=
r?=3D
=3DA0 I am trying to think of everything.=3DA0=3D20
=3DA0
Thanks in advance for your help.=3DA0 It's Christmas and a bad time to be h=
av=3D
ing all of these problems.=3DA0=3D20
=3DA0
Barb Francis
=3DA0
Ron Roy on sun 4 dec 11
Hi Barbara,
Do your glazes have custer spar in them?
RR
Quoting Barbara Francis :
> --- On Sun, 12/4/11, Barbara Francis wrote:
>
>
> From: Barbara Francis
> Subject: Fw: pinholing
> To: "clayart"
> Date: Sunday, December 4, 2011, 4:43 PM
>
>
>
>
>
>
> I am wondering if there was a problem with this message going =3D20
> through?=3DA0 Thanks, Barb Francis
>
> --- On Sun, 12/4/11, Barbara Francis wrote:
>
>
> From: Barbara Francis
> Subject: pinholing
> To: "clayart" , "Laurie Dellis" =3D20
>
> Date: Sunday, December 4, 2011, 1:44 PM
>
>
>
>
>
>
>
> Hi Clayart Potters,
> =3DA0
> I am a potter in Texas and have been firing Cinco Blanco to Cone 6.=3DA0 =
=3D20
> I have been bisquing to 05, with a hold, but am experiencing a lot =3D20
> of pinholing and have increased my bisque to 04, I am also firing =3D20
> slowly.=3DA0 I thought that had helped, I had one better firing, and =3D2=
0
> then the pinholing reappeared.=3DA0 I also wiped down the pottery, =3D20
> thinking maybe there was some dust on it and that was causing the =3D20
> problem.=3DA0
> =3DA0
> I talked with a fellow potter yesterday and she is doing the same =3D20
> thing and also having a lot of pinholing.=3DA0 What are we doing wrong?=
=3DA0 =3D
=3D20
> It is across the board with glazes that previously worked.=3DA0
> =3DA0
> Could it be the clay?=3DA0 Is anyone else having similar problems with =
=3D20
> Cinco Blanco?=3DA0 Could it be the glazes were sitting in a hot garage =
=3D20
> this summer?=3DA0 I am trying to think of everything.=3DA0
> =3DA0
> Thanks in advance for your help.=3DA0 It's Christmas and a bad time to =
=3D20
> be having all of these problems.=3DA0
> =3DA0
> Barb Francis
> =3DA0
>
David Woof on mon 5 dec 11
Hi Barb=3D2C
from what you tell us it doesn't seem to change things when you change the =
=3D
bisque temps.=3D20
If you are using the same glaze batches and getting inconsistent results th=
=3D
is does seem to narrow the clay as suspect.=3D20
How much do you buy at a time.=3DA0 Does the supplier have a lot number for=
e=3D
ach Batch that would tell when and from which lot the raw materials came fr=
=3D
om to make the clay body.
What materials are in your clay body. Could it sometimes be variations in s=
=3D
omething like the new Custer Feldspar which seems to be giving fits to some=
=3D
folks.
Since Cinco Blanco is a cone 5=3D2C and even though you were getting away w=
it=3D
h firing at cone 6=3D2C if an ingredient changed you could be now over firi=
ng=3D
to the point of off gassing at higher temps.
Try your glazes on another white clay body=3D2C or mix a small new batch of=
s=3D
ame glaze and fire it on the body you suspect.
let your supplier know there may be a problem=3D2C perhaps they have had ot=
he=3D
r calls as well. At any rate they need to know. Our relationship with our s=
=3D
uppliers must be seen as symbiotic for win-win.
David Woof
11a. Fw: pinholing
Posted by: "Barbara Francis" barbspots@YAHOO.COM=3D20
Date: Sun Dec 4=3D2C 2011 2:52 pm ((PST))
=3D20
Hi Clayart Potters=3D2C
=3DA0
I am a potter in Texas and have been firing Cinco Blanco to Cone 6.=3DA0 I =
ha=3D
ve been bisquing to 05=3D2C with a hold=3D2C but am experiencing a lot of p=
inho=3D
ling and have increased my bisque to 04=3D2C I am also firing slowly.=3DA0 =
I th=3D
ought that had helped=3D2C I had one better firing=3D2C and then the pinhol=
ing =3D
reappeared.=3DA0 I also wiped down the pottery=3D2C thinking maybe there wa=
s so=3D
me dust on it and that was causing the problem.=3DA0=3D20
=3DA0
I talked with a fellow potter yesterday and she is doing the same thing and=
=3D
also having a lot of pinholing.=3DA0 What are we doing wrong?=3DA0 It is a=
cros=3D
s the board with glazes that previously worked.=3DA0=3D20
=3DA0
Could it be the clay?=3DA0 Is anyone else having similar problems with Cinc=
o =3D
Blanco?=3DA0 Could it be the glazes were sitting in a hot garage this summe=
r?=3D
=3DA0 I am trying to think of everything.=3DA0=3D20
=3DA0
Thanks in advance for your help.=3DA0 It's Christmas and a bad time to be h=
av=3D
ing all of these problems.=3DA0=3D20
=3DA0
Barb Francis
=3DA0=3DA0=3DA0=3D20
=3D
May Luk on mon 5 dec 11
I also have a full load pin-holed.
I have changed my firing ramp, but I don't know if this brought on the
problem of the Custer Spar or merely the problem of a changed firing
schedule.
B-mix clay and a glaze with Custer Spar. I used to fire to close to
cone 7 - ramp hold with a controlled cool with good result (except the
top shelf) This month I am under deadline. So I did a cone fire 6
(instead of ramp hold) and hold for 8 min.Cone pack read 6 and I
thought I can save 2 hours. Nope, I just re-fired (another cone fire 6
with 12 min hold) and the pin holes didn't go away.
I am going to China and source a factory and get a new set of
problems...just for a change
May
Brooklyn NY
On Sun, Dec 4, 2011 at 8:03 PM, Ron Roy wrote:
> Hi Barbara,
>
> Do your glazes have custer spar in them?
>
> RR
>
>
>
> Quoting Barbara Francis :
>
>> --- On Sun, 12/4/11, Barbara Francis wrote:
>>
>>
>> From: Barbara Francis
>> Subject: Fw: pinholing
>> To: "clayart"
>> Date: Sunday, December 4, 2011, 4:43 PM
>>
>>
>>
>>
>>
>>
>> I am wondering if there was a problem with this message going through?
>> Thanks, Barb Francis
>>
>> --- On Sun, 12/4/11, Barbara Francis wrote:
>>
>>
>> From: Barbara Francis
>> Subject: pinholing
>> To: "clayart" , "Laurie Dellis"
>>
>> Date: Sunday, December 4, 2011, 1:44 PM
>>
>>
>>
>>
>>
>>
>>
>> Hi Clayart Potters,
>>
>> I am a potter in Texas and have been firing Cinco Blanco to Cone 6.=3DA0=
I
>> have been bisquing to 05, with a hold, but am experiencing a lot of
>> pinholing and have increased my bisque to 04, I am also firing slowly.=
=3D
=3DA0 I
>> thought that had helped, I had one better firing, and then the pinholing
>> reappeared.=3DA0 I also wiped down the pottery, thinking maybe there was=
s=3D
ome
>> dust on it and that was causing the problem.
>>
>> I talked with a fellow potter yesterday and she is doing the same thing
>> and also having a lot of pinholing.=3DA0 What are we doing wrong?=3DA0 I=
t is=3D
across
>> the board with glazes that previously worked.
>>
>> Could it be the clay?=3DA0 Is anyone else having similar problems with C=
in=3D
co
>> Blanco?=3DA0 Could it be the glazes were sitting in a hot garage this su=
mm=3D
er?=3DA0 I
>> am trying to think of everything.
>>
>> Thanks in advance for your help.=3DA0 It's Christmas and a bad time to b=
e
>> having all of these problems.
>>
>> Barb Francis
>>
>>
>
--=3D20
http://www.artspan.org/artist/mayluk
http://www.ceramicsbrooklyn.com/
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