Diane Woloshyn on fri 29 jan 99
Does anyone have a source for Barnard Slip or a recipe for a good substitute?
Have several slip recipes that call for it. Neither Bennet nor Axner carry it
here in Florida. Thanks for any help you can give me.
Diane Florida Bird Lady
camoore on sat 30 jan 99
Laguna Clay in the Los Angeles area (City of Industry) carries Barnard
Clay (Blackbird). You might email them at . I
have found them very helpful.
Kim Marie on thu 4 feb 99
When I ordered Barnard from Bailey's in new york, I think the substitute
was called blackbird and it worked the same as barnard.
At 09:25 AM 1/29/99 EST, you wrote:
>Does anyone have a source for Barnard Slip or a recipe for a good substitute?
>Have several slip recipes that call for it. Neither Bennet nor Axner
>here in Florida. Thanks for any help you can give me.
>Diane Florida Bird Lady
Craig Martell on sun 15 oct 00
>What is the make up of Barnard Slip(also called Blackbird slip)? Someone
>recently suggested that it is toxic-true?
Here's the lowdown on Barnard. I checked both of my materials databases
and both analyses were about the same. I can't see anything to be
concerned about in regard to toxic.
Barnard Clay........ 100.00 100.00%
CaO 0.21* 0.62%
MgO 0.35* 0.74%
K2O 0.25* 1.24%
Na2O 0.19* 0.62%
TiO2 0.06 0.25%
Al2O3 1.54 8.28%
SiO2 16.21 51.28%
Fe2O3 4.39 36.97%
later, Craig Martell in Oregon
Louis H.. Katz on mon 16 oct 00
Here is what I have, Very different form Craig's, note the MnO2. My source is the
data that came with Hyperglaze
Equivalent Molecular Weight: 937.531
Molecular Formula of Barnard Slip:
K20 0.204 Al2O3 1.000 SiO2 9.325
Na2O 0.018 Fe2O3 0.860 TiO2 0.079
CaO 0.045 MnO2 0.367
MgO 0.175 LOI 3.895
59.74 % SiO2
10.87 % Al2O3
2.05 % K2O
0.12 % Na2O
0.75 % MgO
0.27 % CaO
14.65 % Fe2O3
3.40 % MnO
0.67 % TiO2
7.48 % L.O.I.
100.00 % TOTAL
Craig Martell wrote:
> >What is the make up of Barnard Slip(also called Blackbird slip)? Someone
> >recently suggested that it is toxic-true?
> Here's the lowdown on Barnard. I checked both of my materials databases
> and both analyses were about the same. I can't see anything to be
> concerned about in regard to toxic.
> Barnard Clay........ 100.00 100.00%
> CaO 0.21* 0.62%
> MgO 0.35* 0.74%
> K2O 0.25* 1.24%
> Na2O 0.19* 0.62%
> TiO2 0.06 0.25%
> Al2O3 1.54 8.28%
> SiO2 16.21 51.28%
> Fe2O3 4.39 36.97%
> Cost/kg 1.76
> Si:Al 10.51
> SiB:Al 10.51
> Expan 7.73
> later, Craig Martell in Oregon
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Ron Roy on mon 23 oct 00
I can confirm what Louis is saying here - my analysis is from the mine. It
does have quite a bit more iron (20.27) but I would expect some wild swings
in a material like this.
What this means is - dust with manganese in it and fumes from manganese
when firing it. How much depends on a number of factors - if you tell us
how you use it we can all express our opinions and maybe get wiser.
>Here is what I have, Very different form Craig's, note the MnO2. My source
>data that came with Hyperglaze
>Equivalent Molecular Weight: 937.531
>Molecular Formula of Barnard Slip:
> K20 0.204 Al2O3 1.000 SiO2 9.325
> Na2O 0.018 Fe2O3 0.860 TiO2 0.079
> CaO 0.045 MnO2 0.367
> MgO 0.175 LOI 3.895
> Percentage Analysis
> 59.74 % SiO2
> 10.87 % Al2O3
> 2.05 % K2O
> 0.12 % Na2O
> 0.75 % MgO
> 0.27 % CaO
> 14.65 % Fe2O3
> 3.40 % MnO
> 0.67 % TiO2
> 7.48 % L.O.I.
> 100.00 % TOTAL
93 Pegasus Trail
Ron Mccrary on fri 18 jun 04
I would like to purchase a 50 pound bag of Barnard Slip (Blackbird) -- the
original material and not a substitute. If you would like to sell a bag or
know of a source, please let me know.
bonnie staffel on tue 28 jun 05
I thought I had a small supply of Barnard Slip but cannot find it. Does
anyone know what materials I could substitute for this one?
John Anthony on wed 29 jun 05
> anyone know what materials I could substitute for this one?
> Bonnie Staffel
I have just fired a few tests using the synthetic Barnard sub
that comes from Hammill and Gillespie-
I bought through Krueger Pottery
It is a very good substitute- not quite as black in a 60/40 ash glaze
as the real stuff, but very close.
Rick Hamelin on wed 29 jun 05
www.sheffield-pottery.com has formulate a substitute for Barnard Slip, not to be confused with Barnyard Slip(pery), that is something else and altogether different and being spread on the garden this week, courtesy of the local Dairy farm.
"Many a wiser men than I hath
gone to pot." 1649
-------------- Original message --------------
Ron Roy on fri 1 jul 05
I just did this - I would bet you will get close to the same results with it.
I would leave the manganese out and just add the same amount of iron to
I would test a small amount first. If it's a black slip or glaze you may
find an addition of about 2% cobalt carb instead of the manganese will also
work to get a black.
Red Art - 56.5
OM#4 - 18.0
Silica - 25.5
Red Iron - 23.5
Manganese dioxide 5.5
>I thought I had a small supply of Barnard Slip but cannot find it. Does
>anyone know what materials I could substitute for this one?
15084 Little Lake Road
bonnie staffel on sat 2 jul 05
Thanks, Ron, for that suggestion. I think that I work color in glazes as I
would as a painter, where I received my first training. I use iron or iron
type chemicals to modify other colors. I get a beautiful green from Albany
Slip and Cobalt. I also modify cobalt with iron oxide for the same reason
that I do not want the hot blue that cobalt gives. Same with copper where I
have modified it to get a very good black but also add some frit. I usually
don't measure, just a scoop of this and a scoop of that. When I mix up the
substitute Barnard Clay will try it with the copper to see if I get a
similar effect. I know that there needs to be a balance of the chemistry of
the colorants and glazes, but I leave that to those who have the knowledge
to work with it. When I started out there were no Mason Stains. Now I can
paint with almost abandon using my painterly techniques of mixing the
I am also working on trying to get a watercolor effect by sealing the glaze
underneath so the colors remain wet for blending. Haven't found the right
sealant yet, but when I get the time this winter will go for it again.
Right now it is production time and I should be in the studio working.
Charter Member Potters Council
bill edwards on wed 24 aug 05
There are plenty of subs out there for the original
slip and perhaps many people are using that now and
referring to it as Barnard Slip?
The analysis link is below so you can compare any
differences. They are countless analysis for this
material on the market.
We are taught we can swap a glaze recipe and make it
work so why not another clay? Barnard subs would be
laboratory constucted so to speak and should be
consistent as well if you find it works for you. We
have synthetic irons and GB subs and many other
materials now available that we didn't have
From: Kathy Stecker
Subject: Re: Ebony cone 6 glaze
When discussing this glaze Ron Roy asked, Where will
you get the
Is he inferring that Barnard Slip is unavailable the
way Albany is?
Perhaps it would be a good time to review what
minerals are endangered
extinct in terms of availability?Anyone want to
Winter Springs FL
Edmar Studio and Gallery
302 South Main St (Shipping)
POB 367 (Mailing)
Camp Hill, Al. 36850
Start your day with Yahoo! - make it your home page
lili krakowski on fri 13 nov 09
You wuz warned that Barnard/Blackbird is variable. Guess is that you =3D
are dealing with two mine runs. I do not think there is a difference =3D
between Barnard earth and Barnard Clay...unless one is a not accuraely =3D
labeled substitute. It may be regional--like some folk say Mom and Dad, =
and others Ma and Pa....
Be of good courage