Dennis Tobin on fri 24 sep 04
Wayne,
I am sure that will be the plan. I need to write up the tests that we did
for him. And he needs to find someone to process it. I have less than a 5
gallon bucket left after the tests that we ran.
We will keep the listserv updated.
Dennis
Denis:
> Is he planning on selling it?
> Inquiring minds would like to know (and buy?)
> I think he would have a market for it.
> Wayne Seidl
>
> -----Original Message-----
> From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Dennis
> Tobin
> Sent: Friday, September 24, 2004 12:29 PM
> To: CLAYART@LSV.CERAMICS.ORG
> Subject: Ohio slip clay found similar to Albany Slip, help
>
> I would appreciate any thoughts about this,
> I have been doing some test for a gentleman who has discovered a
> large
> clay vein in south central Ohio on his farm that seems to some what
> similar to Albany Slip. It appears to be from a huge lake bed. He
> had a
> chemical analysis performed by West Penn Spectrochemical and the
> data
> is similar to the analysis of Albany Slip that I have in Cushings
> book.
> The major difference is that there is 4.73% MgO in this virgin Ohio
> Clay. We have also fired it mixed next to Albany as a control in
> several environments as well as in albany slip glazes subbing the
> Ohio
> clay for albany next to one with albany slip as the control and the
> results are similar. The main difference is that the ohio clay,
> maybe
> because of the MgO provides glazes that are a little more buttery
> that
> the control with albany.
> Here is the chemical analysis of the Ohio clay:
> SiO2 56.76
> Al2O3 16.77
> CaO 7.3
> Fe2O3 7.0
> MgO 4.73
> K2O 4.35
> TiO2 1.0
> Na2O .40
> P2O5 .098
> MnO .097
> ZrO .036
>
> As clay we fired a shrinkage test to cone 06 which resulted in a 5%
> shirnkage.
>
> Anyone have any views on the possibility of this being used as a
> glaze
> or clay?
>
> Thanks
> Dennis Tobin
>
> ____________________________________________________________________
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>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
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>
> Moderator of the list is Mel Jacobson who may be reached at
> melpots@pclink.com.
Dennis Tobin on fri 24 sep 04
I would appreciate any thoughts about this,
I have been doing some test for a gentleman who has discovered a large
clay vein in south central Ohio on his farm that seems to some what
similar to Albany Slip. It appears to be from a huge lake bed. He had a
chemical analysis performed by West Penn Spectrochemical and the data
is similar to the analysis of Albany Slip that I have in Cushings book.
The major difference is that there is 4.73% MgO in this virgin Ohio
Clay. We have also fired it mixed next to Albany as a control in
several environments as well as in albany slip glazes subbing the Ohio
clay for albany next to one with albany slip as the control and the
results are similar. The main difference is that the ohio clay, maybe
because of the MgO provides glazes that are a little more buttery that
the control with albany.
Here is the chemical analysis of the Ohio clay:
SiO2 56.76
Al2O3 16.77
CaO 7.3
Fe2O3 7.0
MgO 4.73
K2O 4.35
TiO2 1.0
Na2O .40
P2O5 .098
MnO .097
ZrO .036
As clay we fired a shrinkage test to cone 06 which resulted in a 5%
shirnkage.
Anyone have any views on the possibility of this being used as a glaze
or clay?
Thanks
Dennis Tobin
Edouard Bastarache Inc. on fri 24 sep 04
Hello Dennis,
try making :
1-A throwable C/06-04 terra cotta .
or
2-A dark brown glossy C/8-10 glaze.
Your analysis resembles the analysis of "Quebec Slip"
derived from the analysis of 15 samples of local clays
of the Province of Quebec made by our Ministry of
Natural Resources.
Quebec's clays are remnants of the prehistoric Sea of
Champlain that covered the lowlands of our province
and also some of Ontario's.
They make good C/06-04 terra cotta clays and beautiful
dark glossy brown glazes at C/8-10 in many instances.
Naturally, you have to refine the clay and test.
If you want pictures of what I have obtained, let me know
and I will send.
Later,
"Ils sont fous ces quebecois"
Edouard Bastarache
Irreductible Quebecois
Indomitable Quebeker
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
www.sorel-tracy.qc.ca/~edouardb/Welcome.html
http://perso.wanadoo.fr/smart2000/index.htm
http://www.digitalfire.com/education/toxicity/
Wayne on fri 24 sep 04
Denis:
Is he planning on selling it?
Inquiring minds would like to know (and buy?)
I think he would have a market for it.
Wayne Seidl
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Dennis
Tobin
Sent: Friday, September 24, 2004 12:29 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Ohio slip clay found similar to Albany Slip, help
I would appreciate any thoughts about this,
I have been doing some test for a gentleman who has discovered a
large
clay vein in south central Ohio on his farm that seems to some what
similar to Albany Slip. It appears to be from a huge lake bed. He
had a
chemical analysis performed by West Penn Spectrochemical and the
data
is similar to the analysis of Albany Slip that I have in Cushings
book.
The major difference is that there is 4.73% MgO in this virgin Ohio
Clay. We have also fired it mixed next to Albany as a control in
several environments as well as in albany slip glazes subbing the
Ohio
clay for albany next to one with albany slip as the control and the
results are similar. The main difference is that the ohio clay,
maybe
because of the MgO provides glazes that are a little more buttery
that
the control with albany.
Here is the chemical analysis of the Ohio clay:
SiO2 56.76
Al2O3 16.77
CaO 7.3
Fe2O3 7.0
MgO 4.73
K2O 4.35
TiO2 1.0
Na2O .40
P2O5 .098
MnO .097
ZrO .036
As clay we fired a shrinkage test to cone 06 which resulted in a 5%
shirnkage.
Anyone have any views on the possibility of this being used as a
glaze
or clay?
Thanks
Dennis Tobin
____________________________________________________________________
__________
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your
subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
Ivor and Olive Lewis on sat 25 sep 04
Dear Dennis Tobin,
The potential of any natural material from the crust of the Earth can
be easily investigated.
Usual starting point is a melting test of representative samples to
determine if your find will fuse and the degree of consistency if it
is to be regarded as a useful find. Then you can proceed to line
blends with common melting agents; Felspars, Ashes and Frits. If you
have a substance which melts freely then you can explore line blends
with the usual auxiliary fluxes containing CaO, MgO, SrO etc . If you
wish to elevate the maturity temperature then make blends with other
clays which are available to you
I had some excellent results recently with line blends of a local
Slate powder.
I hope you make good progress with your find.
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
.
Ron Roy on sat 25 sep 04
Hi Dennis,
I have compared it to an analysis of Albany. First of all there is no LOI
included in the % analysis and that is necessary to get a better picture.
As it is now - it is more refractory than Albany - more alumina.
The LOI I have for Albany is 10.40 - that is in the ball park for most clays.
I have some old albany - if you want to send me a small sample I can do
some testing for you.
RR
>I would appreciate any thoughts about this,
>I have been doing some test for a gentleman who has discovered a large
>clay vein in south central Ohio on his farm that seems to some what
>similar to Albany Slip. It appears to be from a huge lake bed. He had a
>chemical analysis performed by West Penn Spectrochemical and the data
>is similar to the analysis of Albany Slip that I have in Cushings book.
>The major difference is that there is 4.73% MgO in this virgin Ohio
>Clay. We have also fired it mixed next to Albany as a control in
>several environments as well as in albany slip glazes subbing the Ohio
>clay for albany next to one with albany slip as the control and the
>results are similar. The main difference is that the ohio clay, maybe
>because of the MgO provides glazes that are a little more buttery that
>the control with albany.
>Here is the chemical analysis of the Ohio clay:
>SiO2 56.76
>Al2O3 16.77
>CaO 7.3
>Fe2O3 7.0
>MgO 4.73
>K2O 4.35
>TiO2 1.0
>Na2O .40
>P2O5 .098
>MnO .097
>ZrO .036
>
>As clay we fired a shrinkage test to cone 06 which resulted in a 5%
>shirnkage.
>
>Anyone have any views on the possibility of this being used as a glaze
>or clay?
>
>Thanks
>Dennis Tobin
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Bonnie Staffel on sun 26 sep 04
When I lived in Maumee, OH, I did not have a high fire kiln, nor did I have
a way to purchase ready made clay at that time - early 50's, but across the
river in Perrysburg, OH, there was a field tile factory. I used to go and
get their extruded still wet tile, make it into a slurry, screen the rocks
out, and then process it into throwing clay. My top temperature for firing
my work was Cone 01. Got a rich red clay but still without distortion.
That was so long ago that I do not recall if made any slip for high fire
after I left Cranbrook, but seem to have some notes about it. I do remember
putting a small piece of clay on a shard and it melted into a blob of very
dark brown shiny material. I will try to find my notebook and report on any
tests I might have made. I also got clay from a flower pot factory in Flat
Rock, MI, which is just over the line from Maumee. That was already clean
so it made it a lot easier to work with. The Perrysburg site is now a
restaurant built into one of the huge kilns.
I have a few pots/sculptures saved from that early work. The woman's head
on Page 1 of my Gallery page right side, was thrown with that clay. It was
also glazed with a lead glaze which was what most early glaze recipes were
based, Binns, deForest Curtis and others of that era.
Warm regards,
Bonnie Staffel
http://webpages.charter.net/bstaffel
http://www.vasefinder.com/
Potters Council member
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