Lenny Dowhie on wed 23 mar 11
I designed a bisque/green ware fix years ago that my students (and I) have
used on and off for years with relatively good results. Might have to
market it someday.
In a message dated 3/23/2011 10:04:23 P.M. Central Daylight Time,
selsor@IMT.NET writes:
This recipe is similar to mine..from the Ceramics Forum
There's another thing called Spooze you might want to try. It's 1/3 dry
clay you're using. 1/3 Vinegar and 1/3 Karo Syrup. add a drop or two of
hydrogem peroxide from time to time to keep it from smelling.
Marcia
On Mar 23, 2011, at 5:59 PM, Lyn Rapley wrote:
> Hello Everyone,
>
> Vince mentioned cat-tails in bisque cracks and Marcia mentioned Spooze.
> What is spooze - how do I make it.
> And for Vince, do you think that cotton from a cotton boll will work
instead of cat-tail fibres as we don't have cat-tails here.
>
> Many thanks,
> Lyn Rapley
> Sint Maarten
Marcia Selsor
http://www.marciaselsor.com
http://ceramicartsdaily.org/potters-council/ceramics-in-tuscany/
Vince Pitelka on wed 23 mar 11
Lyn Rapley wrote:
"Vince mentioned cattails in bisque cracks and Marcia mentioned Spooze.
What is spooze - how do I make it. And for Vince, do you think that cotton
from a cotton boll will work instead of cat-tail fibres as we don't have
cattails here.
Hi Lyn -
I am not sure who mentioned using cattail fibers, but it wasn't me. I have
heard of people using paper clay to do bisque-repairs, but have never tried
it myself. Marcia provided the recipe for Spooze today - it is a patching
medium brought to Clayart by the late and much beloved Peggy Heer - 1/3 eac=
h
of dry clay, vinegar, and Karo syrup. I would consider making spooze with
paper fibers added. It might take a little experimentation to find the bes=
t
mixture.
Good luck -
- Vince
Vince Pitelka
Appalachian Center for Craft
Tennessee Tech University
vpitelka@dtccom.net; wpitelka@tntech.edu
http://iweb.tntech.edu/wpitelka
Marcia Selsor on wed 23 mar 11
I have seen cat tail fuzz used for patching cracks in Uzbekistan. Paper =3D
fibers would do the same.=3D20
Marcia
On Mar 23, 2011, at 5:59 PM, Lyn Rapley wrote:
> Hello Everyone,
>=3D20
> Vince mentioned cat-tails in bisque cracks and Marcia mentioned =3D
Spooze.
> What is spooze - how do I make it.
> And for Vince, do you think that cotton from a cotton boll will work =3D
instead of cat-tail fibres as we don't have cat-tails here.
>=3D20
> Many thanks,
> Lyn Rapley
> Sint Maarten
Marcia Selsor
http://www.marciaselsor.com
http://ceramicartsdaily.org/potters-council/ceramics-in-tuscany/
Marcia Selsor on wed 23 mar 11
This recipe is similar to mine..from the Ceramics Forum
There's another thing called Spooze you might want to try. It's 1/3 dry =3D
clay you're using. 1/3 Vinegar and 1/3 Karo Syrup. add a drop or two of =3D
hydrogem peroxide from time to time to keep it from smelling.
Marcia
On Mar 23, 2011, at 5:59 PM, Lyn Rapley wrote:
> Hello Everyone,
>=3D20
> Vince mentioned cat-tails in bisque cracks and Marcia mentioned =3D
Spooze.
> What is spooze - how do I make it.
> And for Vince, do you think that cotton from a cotton boll will work =3D
instead of cat-tail fibres as we don't have cat-tails here.
>=3D20
> Many thanks,
> Lyn Rapley
> Sint Maarten
Marcia Selsor
http://www.marciaselsor.com
http://ceramicartsdaily.org/potters-council/ceramics-in-tuscany/
Pottery by John on thu 24 mar 11
For Lyn Rapley,
If you are not familiar with Karo Syrup, it is corn syrup. If it is not
available on Sint Maarten, you could probably use any thick bodied syrup
containing a lot of sugar. The purpose of the Karo is to add tackiness and
then to harden up the Spooze repair.
Regards,
John Lowes
Sandy Springs, Georgia
http://wynhillpottery.weebly.com/
----- Original Message -----
From: "Marcia Selsor"
To:
Sent: Wednesday, March 23, 2011 8:50 PM
Subject: Re: Bisque-mend, cattails and patching spooze
This recipe is similar to mine..from the Ceramics Forum
There's another thing called Spooze you might want to try. It's 1/3 dry cla=
y
you're using. 1/3 Vinegar and 1/3 Karo Syrup. add a drop or two of hydrogem
peroxide from time to time to keep it from smelling.
Marcia
On Mar 23, 2011, at 5:59 PM, Lyn Rapley wrote:
> Hello Everyone,
>
> Vince mentioned cat-tails in bisque cracks and Marcia mentioned Spooze.
> What is spooze - how do I make it.
> And for Vince, do you think that cotton from a cotton boll will work
> instead of cat-tail fibres as we don't have cat-tails here.
>
> Many thanks,
> Lyn Rapley
> Sint Maarten
Marcia Selsor
http://www.marciaselsor.com
http://ceramicartsdaily.org/potters-council/ceramics-in-tuscany/
David Woof on fri 25 mar 11
Hi Vince=3D2C all=3D2C
Vince mentioned thinking of adding paper fibers to the spooze. I have bee=
=3D
n advising students to do such with good results. It does enhance the initi=
=3D
al green strength adhesion and bonding. We have left out the corn syrup wi=
=3D
th no apparent effects re effectiveness. I am thinking now of adding a bit=
=3D
of wollastonite as well=3D3B and as always caution against excessive paper=
p=3D
ulp because of possible weakening in the fired strength due to the paper bu=
=3D
rnout. Wollastonite will enhance the green and firing strength because of =
=3D
the unique crystalline structure of its molecules and should offset any dep=
=3D
letion caused by the LOI of the paper fiber.
=3D20
I mention that the dry clay used is best to be made from dry crushed trimmi=
=3D
ngs of the actual clay body to be repaired as this will assure that the men=
=3D
d will also vitrify or otherwise mature to the same degree as the rest of t=
=3D
he body.
=3D20
David Woof
________________________________________________________
=3D20
Re: Bisque-mend=3D2C cattails and patching spooze
Posted by: "Vince Pitelka" vpitelka@DTCCOM.NET=3D20
Date: Thu Mar 24=3D2C 2011 9:57 am ((PDT))
Lyn Rapley wrote:
"Vince mentioned cattails in bisque cracks and Marcia mentioned Spooze.
What is spooze - how do I make it. And for Vince=3D2C do you think that cot=
to=3D
n
from a cotton boll will work instead of cat-tail fibres as we don't have
cattails here.
Hi Lyn -
I am not sure who mentioned using cattail fibers=3D2C but it wasn't me. I h=
av=3D
e
heard of people using paper clay to do bisque-repairs=3D2C but have never t=
ri=3D
ed
it myself. Marcia provided the recipe for Spooze today - it is a patching
medium brought to Clayart by the late and much beloved Peggy Heer - 1/3 eac=
=3D
h
of dry clay=3D2C vinegar=3D2C and Karo syrup. I would consider making spooz=
e wi=3D
th
paper fibers added. It might take a little experimentation to find the best
mixture.
Good luck -
- Vince
=3D20
=3D20
=3D
Lenny Dowhie on fri 25 mar 11
Here's the mix we have used. the students use it on lots of different
cracks. It doesn't mend like glue--i.e.if you break a finger on a figure it=
will
not glue it back on--at least not usually. We use it on green ware,
leather wear, bisque ware and occasionally on glazed ware where a minor cr=
ack
developed and the student wants to fill, re glaze and re fire.
I usually mix it as a paste but as I mention, it can be thinned to use as a
slurry. Play around and see if it helps any of you.
Lenny Dowhie's Crack FIX
50 grams Calcined Kaolin<< We calcine our own- just dump a bowl full into
a bigger bowl and put in the test kiln. Fire to 1000 F and hold it for an
hour or so. When cool, you have calcined epk.
5 grams bentonite
5 Grams 3134 Frit
10 teaspoons -Sodium Silicate'
1 gram Soda Ash
3 drops Flocs
Screen through 100-200 mesh screen
ADD 1.5 teaspoons H2O for runnier mix.
In a message dated 3/25/2011 10:21:52 P.M. Central Daylight Time,
galla@MAGMA.CA writes:
Hi all,
Regarding using paper additive - I wonder how that may affect some water
tightness at the seams in things like teapots? I know that any paper clay
that I have used always leaks if the glaze is crazed. I realize that the
amount of clay used at the seam is very little and if joined properly
should
be all sort of squeezed out, but it still worries me a bit.
Regards,
Eva Gallagher
Deep River, Ontario
http://newfoundoutpotter.blogspot.com/
http://www.valleyartisans.com/gallagher/Gallagher.htm
----- Original Message -----
From: "David Woof"
To:
Sent: Friday, March 25, 2011 12:29 PM
Subject: Re: Bisque-mend, cattails and patching spooze
Hi Vince, all,
Vince mentioned thinking of adding paper fibers to the spooze. I have
been
advising students to do such with good results. It does enhance the initia=
l
green strength adhesion and bonding. We have left out the corn syrup wit=
h
no apparent effects re effectiveness. I am thinking now of adding a bit o=
f
wollastonite as well; and as always caution against excessive paper pulp
because of possible weakening in the fired strength due to the paper
burnout. Wollastonite will enhance the green and firing strength because
of
the unique crystalline structure of its molecules and should offset any
depletion caused by the LOI of the paper fiber.
I mention that the dry clay used is best to be made from dry crushed
trimmings of the actual clay body to be repaired as this will assure that
the mend will also vitrify or otherwise mature to the same degree as the
rest of the body.
David Woof
________________________________________________________
Re: Bisque-mend, cattails and patching spooze
Posted by: "Vince Pitelka" vpitelka@DTCCOM.NET
Date: Thu Mar 24, 2011 9:57 am ((PDT))
Lyn Rapley wrote:
"Vince mentioned cattails in bisque cracks and Marcia mentioned Spooze.
What is spooze - how do I make it. And for Vince, do you think that cotton
from a cotton boll will work instead of cat-tail fibres as we don't have
cattails here.
Hi Lyn -
I am not sure who mentioned using cattail fibers, but it wasn't me. I have
heard of people using paper clay to do bisque-repairs, but have never trie=
d
it myself. Marcia provided the recipe for Spooze today - it is a patching
medium brought to Clayart by the late and much beloved Peggy Heer - 1/3
each
of dry clay, vinegar, and Karo syrup. I would consider making spooze with
paper fibers added. It might take a little experimentation to find the bes=
t
mixture.
Good luck -
- Vince
Eva Gallagher on fri 25 mar 11
Hi all,
Regarding using paper additive - I wonder how that may affect some water
tightness at the seams in things like teapots? I know that any paper clay
that I have used always leaks if the glaze is crazed. I realize that the
amount of clay used at the seam is very little and if joined properly shoul=
d
be all sort of squeezed out, but it still worries me a bit.
Regards,
Eva Gallagher
Deep River, Ontario
http://newfoundoutpotter.blogspot.com/
http://www.valleyartisans.com/gallagher/Gallagher.htm
----- Original Message -----
From: "David Woof"
To:
Sent: Friday, March 25, 2011 12:29 PM
Subject: Re: Bisque-mend, cattails and patching spooze
Hi Vince, all,
Vince mentioned thinking of adding paper fibers to the spooze. I have bee=
n
advising students to do such with good results. It does enhance the initial
green strength adhesion and bonding. We have left out the corn syrup with
no apparent effects re effectiveness. I am thinking now of adding a bit of
wollastonite as well; and as always caution against excessive paper pulp
because of possible weakening in the fired strength due to the paper
burnout. Wollastonite will enhance the green and firing strength because o=
f
the unique crystalline structure of its molecules and should offset any
depletion caused by the LOI of the paper fiber.
I mention that the dry clay used is best to be made from dry crushed
trimmings of the actual clay body to be repaired as this will assure that
the mend will also vitrify or otherwise mature to the same degree as the
rest of the body.
David Woof
________________________________________________________
Re: Bisque-mend, cattails and patching spooze
Posted by: "Vince Pitelka" vpitelka@DTCCOM.NET
Date: Thu Mar 24, 2011 9:57 am ((PDT))
Lyn Rapley wrote:
"Vince mentioned cattails in bisque cracks and Marcia mentioned Spooze.
What is spooze - how do I make it. And for Vince, do you think that cotton
from a cotton boll will work instead of cat-tail fibres as we don't have
cattails here.
Hi Lyn -
I am not sure who mentioned using cattail fibers, but it wasn't me. I have
heard of people using paper clay to do bisque-repairs, but have never tried
it myself. Marcia provided the recipe for Spooze today - it is a patching
medium brought to Clayart by the late and much beloved Peggy Heer - 1/3 eac=
h
of dry clay, vinegar, and Karo syrup. I would consider making spooze with
paper fibers added. It might take a little experimentation to find the best
mixture.
Good luck -
- Vince
David Woof on sat 26 mar 11
Hi Eva=3D2C all=3D2C
=3D20
you expressed a serious concern and it follows the timeless rule of test te=
=3D
st test.
=3D20
I never repair work destined to function in someone's kitchen or hand. I c=
=3D
an make at least two more of most things in the time it takes to be fussing=
=3D
to a dubious repair of a broken one. =3D20
=3D20
If I did have a concern or curiosity=3D3B I would make a cup=3D3B put a qu=
ick =3D
spout on it=3D2C and when leather hard break it off and cut the cup vertica=
ll=3D
y into halves: let all these pieces get bone dry and then spooze them back =
=3D
together and without glazing=3D2C fire to your maturation temp for body and=
g=3D
lazes as if the piece was glazed. Filled with water and set 24 hours on a =
=3D
piece of paper will be your proof.
=3D20
I never do=3D2C advise=3D2C or condone repairing detached handles! Too man=
y is=3D
sues re liability and harm to others=3D3B and certainly not an ethical and =
pr=3D
ofessional practice!!! This includes trying to "glue" them together with G=
=3D
laze which represents deliberate gross ignorance of materials and their pro=
=3D
perties in application.
=3D20
David Woof
________________________________________________________________________
11a. Re: Bisque-mend=3D2C cattails and patching spooze
Posted by: "Eva Gallagher" galla@MAGMA.CA=3D20
Date: Fri Mar 25=3D2C 2011 4:26 pm ((PDT))
=3D20
Hi all=3D2C
Regarding using paper additive - I wonder how that may affect some water
tightness at the seams in things like teapots? I know that any paper clay
that I have used always leaks if the glaze is crazed. I realize that the
amount of clay used at the seam is very little and if joined properly shoul=
=3D
d
be all sort of squeezed out=3D2C but it still worries me a bit.
Regards=3D2C
Eva Gallagher
Deep River=3D2C Ontario
http://newfoundoutpotter.blogspot.com/
http://www.valleyartisans.com/gallagher/Gallagher.htm
=3D20
=3D20
----- Original Message -----
From: "David Woof"
To:
Sent: Friday=3D2C March 25=3D2C 2011 12:29 PM
Subject: Re: Bisque-mend=3D2C cattails and patching spooze
=3D20
=3D20
Hi Vince=3D2C all=3D2C
Vince mentioned thinking of adding paper fibers to the spooze. I have been
advising students to do such with good results. It does enhance the initial
green strength adhesion and bonding. We have left out the corn syrup with
no apparent effects re effectiveness. I am thinking now of adding a bit of
wollastonite as well=3D3B and as always caution against excessive paper pul=
p
because of possible weakening in the fired strength due to the paper
burnout. Wollastonite will enhance the green and firing strength because of
the unique crystalline structure of its molecules and should offset any
depletion caused by the LOI of the paper fiber.
=3D20
I mention that the dry clay used is best to be made from dry crushed
trimmings of the actual clay body to be repaired as this will assure that
the mend will also vitrify or otherwise mature to the same degree as the
rest of the body.
=3D20
David Woof
________________________________________________________
=3D20
Re: Bisque-mend=3D2C cattails and patching spooze
Posted by: "Vince Pitelka" vpitelka@DTCCOM.NET
Date: Thu Mar 24=3D2C 2011 9:57 am ((PDT))
=3D20
Lyn Rapley wrote:
"Vince mentioned cattails in bisque cracks and Marcia mentioned Spooze.
What is spooze - how do I make it. And for Vince=3D2C do you think that cot=
to=3D
n
from a cotton boll will work instead of cat-tail fibres as we don't have
cattails here.
=3D20
Hi Lyn -
I am not sure who mentioned using cattail fibers=3D2C but it wasn't me. I h=
av=3D
e
heard of people using paper clay to do bisque-repairs=3D2C but have never t=
ri=3D
ed
it myself. Marcia provided the recipe for Spooze today - it is a patching
medium brought to Clayart by the late and much beloved Peggy Heer - 1/3 eac=
=3D
h
of dry clay=3D2C vinegar=3D2C and Karo syrup. I would consider making spooz=
e wi=3D
th
paper fibers added. It might take a little experimentation to find the best
mixture.
Good luck -
- Vince
=3D20
=3D
David Woof on sat 26 mar 11
Like to hear of your trials and results.
=3D20
david
> From: galla@magma.ca
> To: woofpots@HOTMAIL.COM=3D3B Clayart@LSV.CERAMICS.ORG
> Subject: Re: Bisque-mend=3D2C cattails and patching spooze
> Date: Sat=3D2C 26 Mar 2011 16:38:39 -0400
>=3D20
> Excellent suggestion regarding cutting in half=3D2C drying - so testing t=
he=3D
=3D20
> worst posible conditions. I will also add a control cup - uncut and ungla=
=3D
zed=3D20
> just in case the clay body somehow may be at fault.
> Thanks
> Eva Gallagher
> Deep River=3D2C Ontario
> http://newfoundoutpotter.blogspot.com/
> http://www.valleyartisans.com/gallagher/Gallagher.htm
> ----- Original Message -----=3D20
> From: "David Woof"
> To:
> Sent: Saturday=3D2C March 26=3D2C 2011 11:00 AM
> Subject: Re: Bisque-mend=3D2C cattails and patching spooze
>=3D20
>=3D20
> Hi Eva=3D2C all=3D2C
>=3D20
> you expressed a serious concern and it follows the timeless rule of test=
=3D
=3D20
> test test.
>=3D20
> I never repair work destined to function in someone's kitchen or hand. I=
=3D
=3D20
> can make at least two more of most things in the time it takes to be fuss=
=3D
ing=3D20
> to a dubious repair of a broken one.
>=3D20
> If I did have a concern or curiosity=3D3B I would make a cup=3D3B put a q=
uick=3D
spout=3D20
> on it=3D2C and when leather hard break it off and cut the cup vertically =
in=3D
to=3D20
> halves: let all these pieces get bone dry and then spooze them back toget=
=3D
her=3D20
> and without glazing=3D2C fire to your maturation temp for body and glazes=
a=3D
s if=3D20
> the piece was glazed. Filled with water and set 24 hours on a piece of=3D=
20
> paper will be your proof.
>=3D20
> I never do=3D2C advise=3D2C or condone repairing detached handles! Too ma=
ny i=3D
ssues=3D20
> re liability and harm to others=3D3B and certainly not an ethical and=3D2=
0
> professional practice!!! This includes trying to "glue" them together wit=
=3D
h=3D20
> Glaze which represents deliberate gross ignorance of materials and their=
=3D
=3D20
> properties in application.
>=3D20
> David Woof
>=3D20
> ________________________________________________________________________
> 11a. Re: Bisque-mend=3D2C cattails and patching spooze
> Posted by: "Eva Gallagher" galla@MAGMA.CA
> Date: Fri Mar 25=3D2C 2011 4:26 pm ((PDT))
>=3D20
> Hi all=3D2C
> Regarding using paper additive - I wonder how that may affect some water
> tightness at the seams in things like teapots? I know that any paper clay
> that I have used always leaks if the glaze is crazed. I realize that the
> amount of clay used at the seam is very little and if joined properly sho=
=3D
uld
> be all sort of squeezed out=3D2C but it still worries me a bit.
> Regards=3D2C
> Eva Gallagher
> Deep River=3D2C Ontario
> http://newfoundoutpotter.blogspot.com/
> http://www.valleyartisans.com/gallagher/Gallagher.htm
>=3D20
>=3D20
> ----- Original Message -----
> From: "David Woof"
> To:
> Sent: Friday=3D2C March 25=3D2C 2011 12:29 PM
> Subject: Re: Bisque-mend=3D2C cattails and patching spooze
>=3D20
>=3D20
> Hi Vince=3D2C all=3D2C
> Vince mentioned thinking of adding paper fibers to the spooze. I have bee=
=3D
n
> advising students to do such with good results. It does enhance the initi=
=3D
al
> green strength adhesion and bonding. We have left out the corn syrup with
> no apparent effects re effectiveness. I am thinking now of adding a bit o=
=3D
f
> wollastonite as well=3D3B and as always caution against excessive paper p=
ul=3D
p
> because of possible weakening in the fired strength due to the paper
> burnout. Wollastonite will enhance the green and firing strength because =
=3D
of
> the unique crystalline structure of its molecules and should offset any
> depletion caused by the LOI of the paper fiber.
>=3D20
> I mention that the dry clay used is best to be made from dry crushed
> trimmings of the actual clay body to be repaired as this will assure that
> the mend will also vitrify or otherwise mature to the same degree as the
> rest of the body.
>=3D20
> David Woof
> ________________________________________________________
>=3D20
> Re: Bisque-mend=3D2C cattails and patching spooze
> Posted by: "Vince Pitelka" vpitelka@DTCCOM.NET
> Date: Thu Mar 24=3D2C 2011 9:57 am ((PDT))
>=3D20
> Lyn Rapley wrote:
> "Vince mentioned cattails in bisque cracks and Marcia mentioned Spooze.
> What is spooze - how do I make it. And for Vince=3D2C do you think that c=
ot=3D
ton
> from a cotton boll will work instead of cat-tail fibres as we don't have
> cattails here.
>=3D20
> Hi Lyn -
> I am not sure who mentioned using cattail fibers=3D2C but it wasn't me. I=
h=3D
ave
> heard of people using paper clay to do bisque-repairs=3D2C but have never=
t=3D
ried
> it myself. Marcia provided the recipe for Spooze today - it is a patching
> medium brought to Clayart by the late and much beloved Peggy Heer - 1/3 e=
=3D
ach
> of dry clay=3D2C vinegar=3D2C and Karo syrup. I would consider making spo=
oze =3D
with
> paper fibers added. It might take a little experimentation to find the be=
=3D
st
> mixture.
> Good luck -
> - Vince
>=3D20
>=3D20
>=3D20
>=3D20
>=3D20
>=3D20
=3D
Eva Gallagher on sat 26 mar 11
Excellent suggestion regarding cutting in half, drying - so testing the
worst posible conditions. I will also add a control cup - uncut and unglaze=
d
just in case the clay body somehow may be at fault.
Thanks
Eva Gallagher
Deep River, Ontario
http://newfoundoutpotter.blogspot.com/
http://www.valleyartisans.com/gallagher/Gallagher.htm
----- Original Message -----
From: "David Woof"
To:
Sent: Saturday, March 26, 2011 11:00 AM
Subject: Re: Bisque-mend, cattails and patching spooze
Hi Eva, all,
you expressed a serious concern and it follows the timeless rule of test
test test.
I never repair work destined to function in someone's kitchen or hand. I
can make at least two more of most things in the time it takes to be fussin=
g
to a dubious repair of a broken one.
If I did have a concern or curiosity; I would make a cup; put a quick spou=
t
on it, and when leather hard break it off and cut the cup vertically into
halves: let all these pieces get bone dry and then spooze them back togethe=
r
and without glazing, fire to your maturation temp for body and glazes as if
the piece was glazed. Filled with water and set 24 hours on a piece of
paper will be your proof.
I never do, advise, or condone repairing detached handles! Too many issues
re liability and harm to others; and certainly not an ethical and
professional practice!!! This includes trying to "glue" them together with
Glaze which represents deliberate gross ignorance of materials and their
properties in application.
David Woof
________________________________________________________________________
11a. Re: Bisque-mend, cattails and patching spooze
Posted by: "Eva Gallagher" galla@MAGMA.CA
Date: Fri Mar 25, 2011 4:26 pm ((PDT))
Hi all,
Regarding using paper additive - I wonder how that may affect some water
tightness at the seams in things like teapots? I know that any paper clay
that I have used always leaks if the glaze is crazed. I realize that the
amount of clay used at the seam is very little and if joined properly shoul=
d
be all sort of squeezed out, but it still worries me a bit.
Regards,
Eva Gallagher
Deep River, Ontario
http://newfoundoutpotter.blogspot.com/
http://www.valleyartisans.com/gallagher/Gallagher.htm
----- Original Message -----
From: "David Woof"
To:
Sent: Friday, March 25, 2011 12:29 PM
Subject: Re: Bisque-mend, cattails and patching spooze
Hi Vince, all,
Vince mentioned thinking of adding paper fibers to the spooze. I have been
advising students to do such with good results. It does enhance the initial
green strength adhesion and bonding. We have left out the corn syrup with
no apparent effects re effectiveness. I am thinking now of adding a bit of
wollastonite as well; and as always caution against excessive paper pulp
because of possible weakening in the fired strength due to the paper
burnout. Wollastonite will enhance the green and firing strength because of
the unique crystalline structure of its molecules and should offset any
depletion caused by the LOI of the paper fiber.
I mention that the dry clay used is best to be made from dry crushed
trimmings of the actual clay body to be repaired as this will assure that
the mend will also vitrify or otherwise mature to the same degree as the
rest of the body.
David Woof
________________________________________________________
Re: Bisque-mend, cattails and patching spooze
Posted by: "Vince Pitelka" vpitelka@DTCCOM.NET
Date: Thu Mar 24, 2011 9:57 am ((PDT))
Lyn Rapley wrote:
"Vince mentioned cattails in bisque cracks and Marcia mentioned Spooze.
What is spooze - how do I make it. And for Vince, do you think that cotton
from a cotton boll will work instead of cat-tail fibres as we don't have
cattails here.
Hi Lyn -
I am not sure who mentioned using cattail fibers, but it wasn't me. I have
heard of people using paper clay to do bisque-repairs, but have never tried
it myself. Marcia provided the recipe for Spooze today - it is a patching
medium brought to Clayart by the late and much beloved Peggy Heer - 1/3 eac=
h
of dry clay, vinegar, and Karo syrup. I would consider making spooze with
paper fibers added. It might take a little experimentation to find the best
mixture.
Good luck -
- Vince
ivor and olive lewis on sun 27 mar 11
Dear David Woof,
You say "Wollastonite will enhance the green and firing strength because of
the unique crystalline structure of its molecules"
Perhaps you would be willing to share your knowledge and describe the
processes that enable this enhancement.
The only facts I can find about this material relating to heat and
temperature are its melting point, given as above 1500 deg C , a phase
change from the Beta form to the alpha form just above 1100 deg C, that it
has the ability to generate eutectics with CaO and Ca3Si2O7 on cooling fro=
m
the melt.and might be expected to commence sintering at about 815 deg C..
Best regards,
Ivor Lewis,
REDHILL,
South Australia
ivor and olive lewis on tue 29 mar 11
Dear David Woof,
Thank you for your exposition.
My Wollastonite is ground to a fine powder, minus 200 mesh so I would be
unsure about the presence of needle like crystals in the batch. Were it
soluble in water and recrystallised in its needle like form as water
evaporated from the binder then it may be that there might be a stronger
joint. I could only speculate on what might happen at higher temperatures.
It will be interesting to learn about the results of your trials.
Best regards,
Ivor.
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