Roger Bourland on thu 2 mar 00
Brother Thomas, in his stunning new book, CREATION OUT OF CLAY, has a
wonderful running yellow glaze, which he calls "iron yellow". He does not
include a recipe and I cannot find one in my books, etc. Does anyone have a
clue about this glaze?
Roger
Des Howard on fri 3 mar 00
Roger
You could try our version of Cardew's yellow glaze as a starting point.
Kaolin (whatever you have) 55%
Limestone 26.25
Silica 18.75
Red iron oxide 4%
Don't apply too thickly, yellow where thickest, red matt where thin,
(clay body underneath dictates).
We fired in reduction cone 9 -10
Des
Roger Bourland wrote:
> ----------------------------Original message----------------------------
> Brother Thomas, in his stunning new book, CREATION OUT OF CLAY, has a
> wonderful running yellow glaze, which he calls "iron yellow". He does not
> include a recipe and I cannot find one in my books, etc. Does anyone have a
> clue about this glaze?
>
> Roger
--
Des & Jan Howard
Lue Pottery
LUE NSW 2850
Australia
Ph/Fax 02 6373 6419
Chris on sat 4 mar 00
Any fake ash + 4 percent Yellow IRON..
Hank Murrow on fri 19 apr 02
>I keep finding references to using iron oxide to produce straw yellow glaze
>colors, but all my tests of RIO produce tan at lower amounts and browns at
>higher amounts. Is there a trick to getting the yellow color? If so,
would
>one of you wonderful people share it with me. Thanks,
>Wanda
Dear Wanda;
At what temperature and atmosphere are you firing? And in what sort
of kiln? I would like to help you.
Best, Hank
Wanda Holmes on fri 19 apr 02
I keep finding references to using iron oxide to produce straw yellow glaze
colors, but all my tests of RIO produce tan at lower amounts and browns at
higher amounts. Is there a trick to getting the yellow color? If so, would
one of you wonderful people share it with me. Thanks,
Wanda
Chris and Nissa on sat 20 apr 02
I've used Iron oxide and rutile to get a yellow at cone 6
oxidation...unfortunately added it to an unknown mix of matt white base so
have no way of knowing how to reproduce. (Didn't have any use for matt
white and was given some unknown premix)-added 7%rutile and 3%red iron oxide
to spice it up and got a great light yellow..not tan at all.
I've tried over ten matt whites from the archives with same percentages of
oxides and got mostly browns and tans or uglies. I, too, would like to make
another iron yellow like I did years ago at cone 10..but am now working at
cone 6 (and food Safe).
Chris
-----Original Message-----
From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
Behalf Of Hank Murrow
Sent: Friday, April 19, 2002 10:52 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Iron Yellow
>I keep finding references to using iron oxide to produce straw yellow glaze
>colors, but all my tests of RIO produce tan at lower amounts and browns at
>higher amounts. Is there a trick to getting the yellow color? If so,
would
>one of you wonderful people share it with me. Thanks,
>Wanda
Dear Wanda;
At what temperature and atmosphere are you firing? And in what sort
of kiln? I would like to help you.
Best, Hank
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Kathy Maves on sat 20 apr 02
Hi Chris,
I use a variation on a cone 6 Fe yellow from Micheal
Bailey's book, Glazes Cone 6. I changed it so it goes
more clear on the edges. I think we're not posting
Bailey's glazes here. The glaze I ended up with is a
dirty goldenrod yellow. Mine is finicky, as it needs a
fairly fast cool. Otherwise it is rich and dependable.
Hope this helps.
Kathy
kathymaves@yahoo.com
--- Chris and Nissa wrote:
> I've used Iron oxide and rutile to get a yellow at
> cone 6
> oxidation...unfortunately added it to an unknown mix
> of matt white base so
> have no way of knowing how to reproduce. (Didn't
> have any use for matt
> white and was given some unknown premix)-added
> 7%rutile and 3%red iron oxide
> to spice it up and got a great light yellow..not tan
> at all.
>
> I've tried over ten matt whites from the archives
> with same percentages of
> oxides and got mostly browns and tans or uglies. I,
> too, would like to make
> another iron yellow like I did years ago at cone
> 10..but am now working at
> cone 6 (and food Safe).
>
> Chris
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don hunt on sat 20 apr 02
I am assuming we are talking about iron yellow such as Thomas Bezanson
produces. I
wish he would publish like Coleman does. I have found that an iron black
refired
to bisque temperature goes yellow. I suspect those glazes are refires.
I think the really great oilspots are refires also. First in reduction then
in
oxidation.
I think the variable in addition to the glazes is the combination of temps
and
atmospheres.
Don Hunt
Wanda Holmes wrote:
> I keep finding references to using iron oxide to produce straw yellow
glaze
> colors, but all my tests of RIO produce tan at lower amounts and browns at
> higher amounts. Is there a trick to getting the yellow color? If so,
would
> one of you wonderful people share it with me. Thanks,
> Wanda
>
>
____________________________________________________________________________
__
> 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.
Hank Murrow on sat 20 apr 02
>I keep finding references to using iron oxide to produce straw yellow glaze
>colors, but all my tests of RIO produce tan at lower amounts and browns at
>higher amounts. Is there a trick to getting the yellow color? If so,
would
>one of you wonderful people share it with me. Thanks,
>Wanda
Dear Wanda;
At what temperature and atmosphere are you firing? And in what sort
of kiln? I would like to help you.
Best, Hank
Cone 6 oxidation in an electric kiln on white stoneware. Thanks, Wanda
Dear Wanda;
I work at C/10 both R & O, so I am not sure if my glaze could
be modified to work @ C/6 in an electric.
However, Rudy's Weird contains Spodumene, ceramic grade ,
Bone Ash, Whiting, Talc, Kaolin, and Silica. The glaze relies for its
color entirely from the impurities in the ceramic-grade Spodumene,
and must be on a porcelain or other white body. Si/Al ratio is 4.6/1.
I am not sure if this combination will give yellow in
Oxidation, but it is worth a try.
Cheers, Hank in Eugene
Judy Wesley on sat 20 apr 02
Wanda,
As I understand it--and it seems to be true--in oxidation stoneware glazes,
which includes Cone 6, calcium in the base glaze is responsible for
producing a yellow from iron. Hamer's "Potter's Dictionary" confirms this.
Under "Colours" they say, "Thus red iron oxide in most cases gives the
reddish brown colour but when surrounded by calcia it is yellow...." And
under "Iron oxide": "up to 4% for yellows". (Figured that info needed to be
quoted directly so I don't make myself out to be a whole lot smarter than I
really am. :-)
Which explains Carol's glaze: Wollastonite is calcium and silica, and rutile
is titanium dioxide with a fair bit of iron. The glaze Hank referred to
contains Whiting as a source of calcium.
Sooo-it seems to me that you might be able to get a great glaze that's not
only yellow, but durable and food-safe, using either of John and Ron's High
Calcium Semimatte Base glazes in "Mastering Cone 6 Glazes". Given the small
amount of iron oxide needed, you might not even have to tweek the base
recipes.
Hope this helps,
Judy
judywesley@qwest.net
Dan Dermer on sat 20 apr 02
If anyone is looking for an Iron Yellow at Cone 6 oxidation, here is one I
enjoyed from the Clayart glaze database on Ceramicsweb...
Klinesville Gold (Jeff Dietrich)
cone: 6 - 7
4.49 Magnesium Carbonate
20.23 Whiting
5.62 Wollastonite
56.18 Nepheline Syenite
13.48 Cedar Heights Redart Clay
Also add:
6.74 Red Iron Oxide
12.36 Zircopax
It looked great on Laguna's Hawaiian Red clay, or Navajo Wheel fired to cone
6. It's a nice satin matt yellow/mustard color, with nice crystals forming
on a smooth, buttery surface. I didn't like it as well on c5 BMIX -- too
mustardy -- but was nice with other colors layered over it, like
purple/pink/mauve (also in the archives).
-Dan
Wanda Holmes on sun 21 apr 02
Thanks, Hank. I'll try some cone 6 experiments in that direction. By
analyzing what each of these adds to the glaze, I may be able to discern the
required combination of ingredients. Bone ash and Talc have come up in
several suggestions - perhaps P2O5 or magnesium play a role in developing
the color???? Wanda
Dear Wanda;
I work at C/10 both R & O, so I am not sure if my glaze could
be modified to work @ C/6 in an electric.
However, Rudy's Weird contains Spodumene, ceramic grade ,
Bone Ash, Whiting, Talc, Kaolin, and Silica. The glaze relies for its
color entirely from the impurities in the ceramic-grade Spodumene,
and must be on a porcelain or other white body. Si/Al ratio is 4.6/1.
I am not sure if this combination will give yellow in
Oxidation, but it is worth a try.
Cheers, Hank in Eugene
____________________________________________________________________________
__
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.
David Hewitt on sun 21 apr 02
Wanda,
Mike Bailey's book 'Glazes Cone 6' chapter15 shows a progression blend
for red iron oxide. 2% - 3% give a straw yellow colour with the
following recipe
Potash feldspar 46.7
China clay 4.0
Bentonite 2.0
Bone Ash 15.0
Lithium carbonate 4.0
Talc 16.9
Flint or quartz 11.4
____
100.0
He doesn't mention the clay body used but I would use either a porcelain
or white stoneware if you want straw yellow.
David
In message , Hank Murrow writes
>>I keep finding references to using iron oxide to produce straw yellow gl=
>aze
>>colors, but all my tests of RIO produce tan at lower amounts and browns =
>at
>>higher amounts. Is there a trick to getting the yellow color? If so, w=
>ould
>>one of you wonderful people share it with me. Thanks,
>>Wanda
>
>
>Dear Wanda;
>
>At what temperature and atmosphere are you firing? And in what sort
>of kiln? I would like to help you.
>
>Best, Hank
--
David Hewitt
David Hewitt Pottery ,
7 Fairfield Road, Caerleon, Newport,
South Wales, NP18 3DQ, UK. Tel:- +44 (0) 1633 420647
FAX:- +44 (0) 870 1617274
Web site http://www.dhpot.demon.co.uk
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