Randy McCall on mon 8 nov 10
I have come across a fake ash glaze that I want to try=3D2C but have notice=
d =3D
some pinholing with this glaze in some examples of pictures. Some folks ar=
=3D
e having to refire to get rid of pinholes. I was wondering if I replaced t=
=3D
he whiting with wollastonite it would smooth the fake ash glaze out enough =
=3D
to get rid of the pinholes. I was reading in an old book where whiting can=
=3D
be gasy that's why I want to try the wollastonite. I know that wollastoni=
=3D
te adds more silicia.
=3D20
Base Glase is
=3D20
Strontium 4%
Whiting 12%
RedArt 24%
=3D20
Want to change to
Strontium 4%
Wollastonite 12%
RedArt 24%
=3D20
Thanks for any help.
Randy
=3D
Larry Kruzan on mon 8 nov 10
<<<<<<<<< SNIP >>>>>>>>>>>
I'll bet if you swap the
strontium for barium (in the proper proportion) your problem will go
away. Just my opinion.
James Freeman
<<<<<<<<<<<<< >>>>>>>>>>>>>
James, Did you really just use the "B" word as a suggestion?????
Oh My Goodness..... Everybody stand by the delete button.
Larry Kruzan
Lost Creek Pottery
www.lostcreekpottery.com
=3D=3D=3D=3D=3D=3D=3D
Email scanned by PC Tools - No viruses or spyware found.
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=3D=3D=3D=3D=3D=3D=3D
Ron Roy on mon 8 nov 10
Hi Randy,
Could be the Red Art that is causing that - the CO2 from whiting
leaves between 800C and 900C.
I just remembered - Strontium carb comes apart much closer to cone 6 -
that might be the problem.
If you want to try a frit version I'll whip up a couple for you.
RR
Quoting Randy McCall :
> I have come across a fake ash glaze that I want to try, but have
> noticed some pinholing with this glaze in some examples of pictures.
> Some folks are having to refire to get rid of pinholes. I was
> wondering if I replaced the whiting with wollastonite it would
> smooth the fake ash glaze out enough to get rid of the pinholes. I
> was reading in an old book where whiting can be gasy that's why I
> want to try the wollastonite. I know that wollastonite adds more
> silicia.
>
> Base Glase is
>
> Strontium 4%
> Whiting 12%
> RedArt 24%
>
> Want to change to
> Strontium 4%
> Wollastonite 12%
> RedArt 24%
>
> Thanks for any help.
>
> Randy
>
>
Sue Cline on mon 8 nov 10
Randy - please post replies and results to the list. I have a similar glaze=
, with similar results, and have essentially stopped using it. I'd like to =
give it another whirl.
Thank you.
Sue Cline
Cincinnati OH
-----Original Message-----
>From: Randy McCall
>Sent: Nov 8, 2010 8:29 AM
>To: Clayart@LSV.CERAMICS.ORG
>Subject: Fake Ash Glaze? Cone 6
>
>I have come across a fake ash glaze that I want to try, but have noticed s=
ome pinholing with this glaze in some examples of pictures. Some folks are=
having to refire to get rid of pinholes. I was wondering if I replaced th=
e whiting with wollastonite it would smooth the fake ash glaze out enough t=
o get rid of the pinholes. I was reading in an old book where whiting can =
be gasy that's why I want to try the wollastonite. I know that wollastonit=
e adds more silicia.
>
>Base Glase is
>
>Strontium 4%
>Whiting 12%
>RedArt 24%
>
>Want to change to
>Strontium 4%
>Wollastonite 12%
>RedArt 24%
>
>Thanks for any help.
>
>Randy
>
>
James Freeman on mon 8 nov 10
On Mon, Nov 8, 2010 at 3:08 PM, Ron Roy wrote:
>
> I just remembered - Strontium carb comes apart much closer to cone 6 -
> that might be the problem.
>
I concur with Ron that the strontium is the likely culprit. Every
cone 6 glaze that I have ever tried with strontium has pinholed badly,
some only at times, and some constantly. I'll bet if you swap the
strontium for barium (in the proper proportion) your problem will go
away. Just my opinion.
All the best.
...James
James Freeman
"All I say is by way of discourse, and nothing by way of advice.=3DA0 I
should not speak so boldly if it were my due to be believed."
-Michel de Montaigne
http://www.jamesfreemanstudio.com
http://www.flickr.com/photos/jamesfreemanstudio/
http://www.jamesfreemanstudio.com/resources
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