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oxidation and wood ash?

updated sun 17 sep 06

 

Paul Herman on wed 13 sep 06


Hello Scott,

Wood ash is a usable material in oxidation too. It functions as a
flux at higher temperatures. You didn't say what cone you are firing to.

Flashing slips are mostly used in fuel burning kilns of some kind,
wood or salt/soda. They respond to vapors and fine ash. I imagine
they might show some flashing around certain volatile glazes though.

best,

Paul Herman

Great Basin Pottery
Doyle, California US
http://greatbasinpottery.com


On Sep 13, 2006, at 5:30 PM, Scott Hunnicutt wrote:

> hey all,
>
> couple of questions for y'all.
> Can you put wood ash/make a wood ash glaze that you can fire in
> oxidation?
>
> question two: can you put flashing slip on a piece of ware and fire
> it in
> oxidation?
>
> thanks, for answers in advance.
>
> Scott Hunnicutt
> begginer potter
>

Scott Hunnicutt on wed 13 sep 06


hey all,

couple of questions for y'all.
Can you put wood ash/make a wood ash glaze that you can fire in oxidation?

question two: can you put flashing slip on a piece of ware and fire it in
oxidation?

thanks, for answers in advance.

Scott Hunnicutt
begginer potter

Richard Aerni on thu 14 sep 06


>On 9/14/06, Scott Hunnicutt wrote:
>>
>> couple of questions for y'all.
>> Can you put wood ash/make a wood ash glaze that you can fire in oxidation?

Scott,
Simple answer...yes you can. You don't mention what cone you're firing to,
or what you're hoping to do with the glaze, but they are a great ingredient
from mid-range stoneware on up. Small additions to a glaze can help to
change it and create "character." Larger additions can give you the running
effects traditionally associated with ash glazes, when properly fluxed.
Good luck with it all,
Richard Aerni
Rochester, NY

Mud Duck Pottery on thu 14 sep 06


Scott

I fire cone 6 oxidation and wood ash glazes are in almost every load.

A wood ash glaze that works well for me is Val's ash. There are a lot of ash
recipes in the archives also, in fact that's where I found Val's ash glaze.

Gene & Latonna
mudduck@mudduckpottery.net
www.mudduckpottery.net


----- Original Message -----
From: "Scott Hunnicutt"
To:
Sent: Wednesday, September 13, 2006 8:30 PM
Subject: oxidation and wood ash?

Lee Love on thu 14 sep 06


On 9/14/06, Scott Hunnicutt wrote:
>
> hey all,
>
> couple of questions for y'all.
> Can you put wood ash/make a wood ash glaze that you can fire in oxidation?


Yes. I was experimenting with ash glazes over Alberta slip glazes at cone
6 oxidation before I moved to Japan. There is an old CM article on the
subject. The slip glazes under the ash glaze percolate and break the
surface of the ash glazes over it.

question two: can you put flashing slip on a piece of ware and fire it in
> oxidation?
>

In salt, soda or wood fire oxidation flashing slips work well. You
get brighter colors in oxidation. See my unglazed woodfired work:

http://potters.blogspot.com/

But you need the vapor atmosphere to cause flashing.

One thing they do here in electric is place pots on top of rice
husk ash and sea shells. These make flashing on underside of the
work. The other way is to sagger fire, but the electric elements here are
thicker and are not damaged by the resultant vapor.

--

Lee in Mashiko, Japan
http://potters.blogspot.com/
"Let the beauty we love be what we do." - Rumi

Len Cockman on fri 15 sep 06



Scott:


You bet you can.  The results may not be the same but you will still get the drizzly ash look.  I helped out with a weeklong wood-firing with the grad students at Notre Dame last April.  I found that you need to screen the ashes about 4 times with a talisman sieve and add some of that to a base glaze batch.  You might need to add something to defloc the glaze.  Ashes made my batch like a really thick milkshake.  You can add some sodium silicate, darvan or muriatic acid (about a tablespoon per gallon) This stuff makes the too thick glaze separate in an instant.  Add your favorite coloring oxide and there you go.


Have fun,


Len Cockman







From:  Scott Hunnicutt <schunn99@BELLSOUTH.NET>
Reply-To:  Clayart <CLAYART@LSV.CERAMICS.ORG>
To:  CLAYART@LSV.CERAMICS.ORG
Subject:  oxidation and wood ash?
Date:  Wed, 13 Sep 2006 20:30:04 -0400
>hey all,
>
>couple of questions for y'all.
>Can you put wood ash/make a wood ash glaze that you can fire in oxidation?
>
>question two: can you put flashing slip on a piece of ware and fire it in
>oxidation?
>
>thanks, for answers in advance.
>
>Scott Hunnicutt
>begginer potter
>
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