William & Susan Schran User on fri 25 nov 11
A colleague of mine does production slipcasting and ram press ware.
During a recent visit to his studio he showed me a problem with a glaze on
slip cast pots.
The pots are cast into a shape that has some rather sharp edges.
At these edges, a mat turquoise glaze, that appears to be fine over the res=
t
of the pot bubbles or becomes rough at the sharp edges.
He throws with the same body adding kyanite for throwing and has no problem=
s
on the thrown ware.
I asked if he did any additional smoothing or wiping with water at the edge=
s
and he does not.
He's thinking about spraying on a slip of the throwing body over the slip
cast pot to see if that would help.
Any suggestions from folks who have experience with slipcast ware?
Thanks, Bill
--
William "Bill" Schran
wschran@cox.net
wschran@nvcc.edu
http://www.creativecreekartisans.com
marci Boskie's Mama =3D^..^=3D on sat 26 nov 11
>Bill Schran said:
>A colleague of mine does production slipcasting and ram press ware.
>During a recent visit to his studio he showed me a problem with a glaze on
>slip cast pots.
>The pots are cast into a shape that has some rather sharp edges.
>At these edges, a mat turquoise glaze, that appears to be fine over the re=
st
>of the pot bubbles or becomes rough at the sharp edges.
>Thanks, Bill
Hi Bill,
I noticed that when I was trying to figure out how thickly to glaze
my once fired ware, if I didnt put on enough glaze , I would get
pinholes that looked like little volcanic craters. With the proper
thickness, the problem went away .
So is it possible that the glaze becomes too thin over the sharp edges?
marci the chinapainter
Ron Roy on sat 26 nov 11
Hi Bill,
The salts used to deflocc clay can do this - they migrate to the rim
during drying and over flux the clay at the end of the glaze firing.
Specifically a problem with thin edges.
Drying the ware upside down may be a cure - adding undoctored clay
might do the trick as well.
RR
Quoting William & Susan Schran User :
> A colleague of mine does production slipcasting and ram press ware.
> During a recent visit to his studio he showed me a problem with a glaze o=
n
> slip cast pots.
> The pots are cast into a shape that has some rather sharp edges.
> At these edges, a mat turquoise glaze, that appears to be fine over the r=
est
> of the pot bubbles or becomes rough at the sharp edges.
> He throws with the same body adding kyanite for throwing and has no probl=
ems
> on the thrown ware.
> I asked if he did any additional smoothing or wiping with water at the ed=
ges
> and he does not.
> He's thinking about spraying on a slip of the throwing body over the slip
> cast pot to see if that would help.
> Any suggestions from folks who have experience with slipcast ware?
>
> Thanks, Bill
>
> --
> William "Bill" Schran
> wschran@cox.net
> wschran@nvcc.edu
> http://www.creativecreekartisans.com
>
Lenny Dowhie on sat 26 nov 11
Sanding the work might help as well-Especially if the edges are already
sharp-you can keep them that way or you can slightly round them.
Regards,
Lenny Dowhie
Professor Emeritus
U. of S. Indiana
In a message dated 11/26/2011 12:08:55 P.M. Central Standard Time,
ronroy@CA.INTER.NET writes:
Hi Bill,
The salts used to deflocc clay can do this - they migrate to the rim
during drying and over flux the clay at the end of the glaze firing.
Specifically a problem with thin edges.
Drying the ware upside down may be a cure - adding undoctored clay
might do the trick as well.
RR
Quoting William & Susan Schran User :
> A colleague of mine does production slipcasting and ram press ware.
> During a recent visit to his studio he showed me a problem with a glaze
on
> slip cast pots.
> The pots are cast into a shape that has some rather sharp edges.
> At these edges, a mat turquoise glaze, that appears to be fine over the
rest
> of the pot bubbles or becomes rough at the sharp edges.
> He throws with the same body adding kyanite for throwing and has no
problems
> on the thrown ware.
> I asked if he did any additional smoothing or wiping with water at the
edges
> and he does not.
> He's thinking about spraying on a slip of the throwing body over the sli=
p
> cast pot to see if that would help.
> Any suggestions from folks who have experience with slipcast ware?
>
> Thanks, Bill
>
> --
> William "Bill" Schran
> wschran@cox.net
> wschran@nvcc.edu
> http://www.creativecreekartisans.com
>
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