Paul Borian on wed 10 feb 10
one of my base glazes uses 30% local clay from a pond and i recently tried
substituting redart for it on some tiles. It looked similar but possibly
better. Just wondering if anyone is using a considerable amount in their
glazes and, if so, do they tend to be problematic at all? My slip glaze
tends to blister in certain conditions, which is why i am experimenting
with redart just to see if the clay is the problem.
i would be interested to hear of anyone's experience with this clay in a
glaze. I fire to cone 10/11 BTW.
thanks,
Paul
David Beumee on wed 10 feb 10
Redart has a pyrometric cone equivelent (PCE) of cone 13, and you may
experience less blistering with its use than the local clay you've been
using, which may be a clay that has a PCE within the range of what you fire=
,
cone 10/11. Other high-iron clays to sub in would be Newman Red, PCE cone
19, Old Hickory F-2, PCE cone 16, or Firered from Plainsman clays in Canada=
.
I've developed a series of orange, red/orange and red shino glazes using a
fireclay that is local here in Colorado, Apache fireclay. They work at cone
10/11 reduction because Apache is a true fireclay, like Firered, and has a
PCE well beyond cone 10/11.
David Beumee
Lafayette, CO
On Tue, Feb 9, 2010 at 11:03 PM, Paul Borian wrote=
:
> one of my base glazes uses 30% local clay from a pond and i recently trie=
d
> substituting redart for it on some tiles. It looked similar but possibly
> better. Just wondering if anyone is using a considerable amount in their
> glazes and, if so, do they tend to be problematic at all? My slip glaze
> tends to blister in certain conditions, which is why i am experimenting
> with redart just to see if the clay is the problem.
> i would be interested to hear of anyone's experience with this clay in a
> glaze. I fire to cone 10/11 BTW.
> thanks,
> Paul
>
Lee Love on wed 10 feb 10
On Wed, Feb 10, 2010 at 12:03 AM, Paul Borian wrot=
=3D
e:
> i would be interested to hear of anyone's experience with this clay in a
> glaze. I fire to cone 10/11 BTW.
> thanks,
> Paul
One of Bob Briscoe's glazes is half woodash and half redart.
--=3D20
--
Lee, a Mashiko potter in Minneapolis
http://mashikopots.blogspot.com/
=3D93Observe the wonders as they occur around you. Don't claim them. Feel
the artistry moving through and be silent.=3D94 --Rumi
Eva Gallagher on wed 10 feb 10
Hi Paul - I like to use Hannah Fake Ash - 60 red art, 30 Whiting and 10 Str
Carb with 4% ochre. I really like it. I think it is one of the glazes that
Steven Hill uses over the Str Crytal glaze. However from time to time I get
blistering - random and also small bubles in a cluster forming a scab. I
think it may have to do with slip that I use underneath - Richard Aern's
colour active slip or the Cynthia Bringle slip. However it also seems to be
just by itself but not as often.
I also use a local clay by itself - which makes a nice opaque brown -
shiny - and there I never get a single blister. Maybe it is the added
calcium in the Hannah glaze?
Eva Gallagher
deep River Ontario
http://www.valleyartisans.com/gallagher/Gallagher.htm
----- Original Message -----
From: "Paul Borian"
To:
Sent: Wednesday, February 10, 2010 1:03 AM
Subject: Redart-based slip glazes?
> one of my base glazes uses 30% local clay from a pond and i recently trie=
d
> substituting redart for it on some tiles. It looked similar but possibly
> better. Just wondering if anyone is using a considerable amount in their
> glazes and, if so, do they tend to be problematic at all? My slip glaze
> tends to blister in certain conditions, which is why i am experimenting
> with redart just to see if the clay is the problem.
> i would be interested to hear of anyone's experience with this clay in a
> glaze. I fire to cone 10/11 BTW.
> thanks,
> Paul
>
>
Edouard Bastarache on wed 10 feb 10
Some of my Redart Glazes :
http://ironredslipglazes.blogspot.com/
http://www.flickr.com/photos/potier/81730977/
Gis,
Edouard Bastarache
Spertesperantisto (Lernu-Paris)
Sorel-Tracy
Quebec
http://edouardbastarache.blogspot.com/
http://www.flickr.com/photos/30058682@N00/
http://cerampeintures.blogspot.com/
http://albertpaintings.blogspot.com/
http://perso.wanadoo.fr/smart2000/index.htm
Paul Haigh on thu 11 feb 10
Lee et al- not sure I'd call 50/50 redart and ash a "slip glaze" (though ma=
ybe I misuse the phrase in all my "self taught" wisdom :)
When I made up 50/50- it was a very runny green ash rivulet type effect wit=
h awesome crystals throughout (fired hot- in a wood kiln) rather than a sli=
p-like effect. In fact, should I re-address this glaze test, I'll need to s=
tiffen it up considerably to get it to stay on pots. It is a good artsy gla=
ze, but maybe not a great functional glaze with my ash- but we know ashes a=
ll vary considerably.
Several variations are found in Phil Rogers' Ash Glazes book.
>>Lee Love sez: One of Bob Briscoe's glazes is half woodash and half redart=
.
-pH
http://wileyhill.com
Lee Love on thu 11 feb 10
On Thu, Feb 11, 2010 at 7:43 AM, Paul Haigh wrote:
> When I made up 50/50- it was a very runny green ash rivulet type effect w=
=3D
ith awesome crystals
> throughout (fired hot- in a wood kiln) rather than a slip-like effect. In=
=3D
fact, should I re-address >this glaze test, I'll need to stiffen it up con=
=3D
siderably to get it to stay on pots. It is a good artsy >glaze, but maybe n=
=3D
ot a great functional glaze with my ash- but we know ashes all vary >consid=
=3D
erably.
My teacher's base glaze started as 50% ball clay 50% ash. He
adjusted from there. My version in Mashiko was 3 wood ash 2 ball
clay 1 amakusa stone (porcelain stone.)
I am mixing synthetic test versions I calculated in GlazeChem for
friends when I was still in Mashiko:
Synthetic Shimaoka Nami Jiro cone 10.
EPK 49
Whiting 14
Dolomite 8
Silica 7.4
Custer 7.4
custer 24
Mag Carb .07
Bone ash 2.3
R. I Ox. .08
I will do a line blend adding 5 and 10% Kaolin. I may test
tile 6 instead of EPK too. When John Anthony tested for me, it beaded
and I would like it more smooth for glaze trailing over it. If
anybody tries
> Several variations are found in Phil Rogers' Ash Glazes book.
This is a very useful ash glaze book. He shows us an emphirical
way to work with glazes without glaze calculation.
--
Lee, a Mashiko potter in Minneapolis
http://mashikopots.blogspot.com/
=3D93Observe the wonders as they occur around you. Don't claim them. Feel
the artistry moving through and be silent.=3D94 --Rumi
Russel Fouts on fri 12 feb 10
Paul
I would call any glaze with 50% clay a slip glaze.
I don't think a slip glaze is defined by what it does but what's in it, =3D
how much clay. They can also, usually be applied to leather hard or even =
=3D
freshly thrown work as well.=3D20
I did a lot of work in school with slip glazes that were only varying =3D
ammounts of clay and ash arrived at through line blends.
SOOO simple, so easy to work with and they also offer a lot of unique =3D
decorative possibilities like being able to be applied to freshly thrown =
=3D
or leather hard pots and then scratched through to the body underneath.
Very nice, very simple.
Yours probably just needs more clay or a higher fired clay to make it =3D
less runny.
Russel
x------------------------------
Date: Thu, 11 Feb 2010 13:43:31 +0000
From: Paul Haigh
Subject: Re: Redart-based slip glazes?
Lee et al- not sure I'd call 50/50 redart and ash a "slip glaze" (though =
=3D
maybe I misuse the phrase in all my "self taught" wisdom :)
When I made up 50/50- it was a very runny green ash rivulet type effect =3D
with awesome crystals throughout (fired hot- in a wood kiln) rather than =
=3D
a slip-like effect. In fact, should I re-address this glaze test, I'll =3D
need to stiffen it up considerably to get it to stay on pots. It is a =3D
good artsy glaze, but maybe not a great functional glaze with my ash- =3D
but we know ashes all vary considerably.
Several variations are found in Phil Rogers' Ash Glazes book.
>> Lee Love sez: One of Bob Briscoe's glazes is half woodash and half =3D
redart.
-pH
http://wileyhill.com
-----------------------------
Russel Fouts
Mes Potes & Mes Pots
Brussels, Belgium
Tel: +32 2 223 02 75
Mobile: +32 476 55 38 75
http://www.mypots.com
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"Look, it's my misery that I have to paint this kind of painting, it's =3D
your misery that you have to love it, and the price of the misery is =3D
thirteen hundred and fifty dollars. "
- Mark Rothko, In Art/Painting
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