Ed Gould on mon 12 aug 02
Using alligator glaze (gerstley borate 74%, Bone Ash 19%, copper carbonate 4.7% and Cobalt oxide 2.3%) i have been firing a tree of life shaped menorah 15 inches high and 12 inches wide with but one failing. I want to get those rich shiny reds and blues. I get them only on the base of the menorah {somewhat dry}. The upper part is a dull copper color. How can I get those rich colors over the entire piece, preferably shiny??.
I'm firing to cone 05 bending; 04 is up. Pyrometer says 1780 F. Reduction is in an ash can about 20 inches high, using cardboard and paper + saw dust for reduction......sealed with sheets of wet newspaper and then covered with the ash can lid. Bigger ash can? More flame? Help.
Ed Gould
Tony Ferguson on mon 12 aug 02
Ed,
In order to get the juice you descrive, you need to hit the entire piece
with reduction material so that there are flames everyone. Try more flame
and even firing it on its side. Also, after you reduce it for 10 seconds,
take the lid off, let it "foof" (air reignites material) and throw more saw
dust of different size particals--dust, shavings--the shavings will keep
burning a bit and etch those beautiful colors as the can is sealed. Have
fun Raku na mon.
Thank you.
Tony Ferguson
Stoneware, Porcelain, Raku
www.aquariusartgallery.com
218-727-6339
315 N. Lake Ave
Apt 312
Duluth, MN 55806
----- Original Message -----
From: "Ed Gould"
To:
Sent: Monday, August 12, 2002 1:32 PM
Subject: Alligator raku tree of life
> Using alligator glaze (gerstley borate 74%, Bone Ash 19%, copper carbonate
4.7% and Cobalt oxide 2.3%) i have been firing a tree of life shaped menorah
15 inches high and 12 inches wide with but one failing. I want to get
those rich shiny reds and blues. I get them only on the base of the
menorah {somewhat dry}. The upper part is a dull copper color. How can I
get those rich colors over the entire piece, preferably shiny??.
>
> I'm firing to cone 05 bending; 04 is up. Pyrometer says 1780 F.
Reduction is in an ash can about 20 inches high, using cardboard and paper +
saw dust for reduction......sealed with sheets of wet newspaper and then
covered with the ash can lid. Bigger ash can? More flame? Help.
> Ed Gould
>
>
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>
Marcia Selsor on mon 12 aug 02
Hi Ed!
I think you are not getting even heat in your kiln. Also pyrometer sounds off. I was firing this weekend in Red Lodge, Montana.
We were firing to 1850-1900 degrees.
If you have a fiber kiln build the base up with brick to make the top of the kiln further away from the top of your piece. Reduce with newspapers. Maybe give it a burp after a minute or so and let it ignite. Stand back.
Best regards and glad to see you're back on Clayart.
Marcia in Montana
Ed Gould wrote:
> Using alligator glaze (gerstley borate 74%, Bone Ash 19%, copper carbonate 4.7% and Cobalt oxide 2.3%) i have been firing a tree of life shaped menorah 15 inches high and 12 inches wide with but one failing. I want to get those rich shiny reds and blues. I get them only on the base of the menorah {somewhat dry}. The upper part is a dull copper color. How can I get those rich colors over the entire piece, preferably shiny??.
>
> I'm firing to cone 05 bending; 04 is up. Pyrometer says 1780 F. Reduction is in an ash can about 20 inches high, using cardboard and paper + saw dust for reduction......sealed with sheets of wet newspaper and then covered with the ash can lid. Bigger ash can? More flame? Help.
> Ed Gould
>
> ______________________________________________________________________________
> 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.
Celia Littlecreek on tue 13 aug 02
snipped>How can I get those rich colors over the entire piece, =
preferably shiny??.
I am not an expert, but I get pretty good results by:
1. Fire your Raku kiln in an oxidizing atmosphere.
2. Use only shredded newspaper (no adds)
3. Match as close as possible, the size of your piece, to the size of =
your post-fire container. (This limits the amount of oxygen=20
your piece can soak up.)
4. Ignite your paper before you put your piece in.
5. If your piece is flat, try not to let the front trap the =
combustibles. Try to keep the piece vertical.
6 Cover tightly.
I think you will have a hard time getting alligator to get shiny. I =
think it is meant to be a matt glaze. Have you tried New Rogers Black =
or Del Favero Luster? Both are shiny. I sculpt trees on some of my =
pots. I have a glaze that makes it look like bark. It is called Tsuyus =
Mistake, but it is also "mostly" matt. If you are interested I can give =
you recipes. Good luck, lets see a picture.
Celia Littlecreek
Littlecreeks Uniques
littlec@paulbunyan.net
william schran on tue 13 aug 02
Ed - for better reduction of glaze at top (which will cool faster)
try putting in post-firing reduction upside down or throwing some
shredded newspaper on top of the work right before you seal the can.
Bill
Craig Clark on tue 13 aug 02
The closest that you can get to "shiny" with the alligator is to mix the
glaze very thin and fire it higher than you would normally fire a raku
glaze. Just look for the sheen on the side of the pot and then let it fire
up a good bit more. I fire by color so I can't tell you what temp for sure
but would guess that it is up toward 2000 F.
Craig Dunn Clark
619 East 11 1/2 st
Houston, Texas 77008
(713)8611-2083
mudman@hal-pc.org
----- Original Message -----
From: "Celia Littlecreek"
To:
Sent: Tuesday, August 13, 2002 12:07 AM
Subject: Re: Alligator Raku tree of life
snipped>How can I get those rich colors over the entire piece, preferably
shiny??.
I am not an expert, but I get pretty good results by:
1. Fire your Raku kiln in an oxidizing atmosphere.
2. Use only shredded newspaper (no adds)
3. Match as close as possible, the size of your piece, to the size of your
post-fire container. (This limits the amount of oxygen
your piece can soak up.)
4. Ignite your paper before you put your piece in.
5. If your piece is flat, try not to let the front trap the combustibles.
Try to keep the piece vertical.
6 Cover tightly.
I think you will have a hard time getting alligator to get shiny. I think
it is meant to be a matt glaze. Have you tried New Rogers Black or Del
Favero Luster? Both are shiny. I sculpt trees on some of my pots. I have
a glaze that makes it look like bark. It is called Tsuyus Mistake, but it
is also "mostly" matt. If you are interested I can give you recipes. Good
luck, lets see a picture.
Celia Littlecreek
Littlecreeks Uniques
littlec@paulbunyan.net
____________________________________________________________________________
__
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.
Craig Clark on tue 13 aug 02
Ed, from the sound of your post you either have an uneven firing in your
kiln or the glaze application on the piece is different from top to bottom.
Craig Dunn Clark
619 East 11 1/2 st
Houston, Texas 77008
mudman@hal-pc.org
----- Original Message -----
From: "Ed Gould"
To:
Sent: Monday, August 12, 2002 3:32 PM
Subject: Alligator raku tree of life
> Using alligator glaze (gerstley borate 74%, Bone Ash 19%, copper carbonate
4.7% and Cobalt oxide 2.3%) i have been firing a tree of life shaped menorah
15 inches high and 12 inches wide with but one failing. I want to get
those rich shiny reds and blues. I get them only on the base of the
menorah {somewhat dry}. The upper part is a dull copper color. How can I
get those rich colors over the entire piece, preferably shiny??.
>
> I'm firing to cone 05 bending; 04 is up. Pyrometer says 1780 F.
Reduction is in an ash can about 20 inches high, using cardboard and paper +
saw dust for reduction......sealed with sheets of wet newspaper and then
covered with the ash can lid. Bigger ash can? More flame? Help.
> Ed Gould
>
>
____________________________________________________________________________
__
> 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.
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