Adron Lilly on thu 15 apr 10
I've been experimenting with the cone 6 glazes in John and Ron's book
(great book!) and have had their glaze called "Waterfall" develop a
bit of red, along with the usual crystals.
http://tinyurl.com/yylx9ql
My question is; How does the red develop in oxidation?
I fired the kiln with the top peep hole open and the downdraft vent
running so had plenty of air.
The picture is of the area inside the foot ring of a porcelain (Mile
High "Aspen" body) bowl.
The bowl was fired twice to cone 6 with slow cooling both times, the
red appeared after the second firing.
Adron
Adron Lilly on thu 15 apr 10
> Adron,
>A quite brilliant red, especially where it is in contrast with other
> colors, can develop from iron in oxidation. I usually fired my
> oxidation iron reds rapidly to only ^5, then a fast cool. I also
> had to apply the glaze a bit thicker than other glazes.
>Here's an example from my web site:
>http://www.creativecreekartisans.com/creativecreek_mywork6ironred.htm
>It is a iron red glaze that usually develops a strong red color
> when refired just to bisque temperature (^06). I have not
> listed the glaze recipe on my web site because it is >an=3D20
>unstable glaze, not suitable for functional ware.
>Contact me if you want to try the recipe.
>Bill
>--=3D20
>William "Bill" Schran
>wschran@cox.net
>wschran@nvcc.edu
>http://www.creativecreekartisans.com
Bill,
Thanks for the information and all that you share at your web site.=3D20
Nice photos of beautiful pots.
I think the first thing in pursuing crystalline glazes is to figure
out run off containment! =3D20
Adron
William & Susan Schran User on thu 15 apr 10
On 4/15/10 12:27 PM, "Adron Lilly" wrote:
> I've been experimenting with the cone 6 glazes in John and Ron's book
> (great book!) and have had their glaze called "Waterfall" develop a
> bit of red, along with the usual crystals.
> http://tinyurl.com/yylx9ql
> My question is; How does the red develop in oxidation?
> I fired the kiln with the top peep hole open and the downdraft vent
> running so had plenty of air.
> The picture is of the area inside the foot ring of a porcelain (Mile
> High "Aspen" body) bowl.
> The bowl was fired twice to cone 6 with slow cooling both times, the
> red appeared after the second firing.
Adron,
A quite brilliant red, especially where it is in contrast with other colors=
,
can develop from iron in oxidation. I usually fired my oxidation iron reds
rapidly to only ^5, then a fast cool. I also had to apply the glaze a bit
thicker than other glazes.
Here's an example from my web site:
http://www.creativecreekartisans.com/creativecreek_mywork6ironred.htm
It is a iron red glaze that usually develops a strong red color when refire=
d
just to bisque temperature (^06). I have not listed the glaze recipe on my
web site because it is an unstable glaze, not suitable for functional ware.
Contact me if you want to try the recipe.
Bill
--
William "Bill" Schran
wschran@cox.net
wschran@nvcc.edu
http://www.creativecreekartisans.com
Adron Lilly on thu 15 apr 10
Thanks for the explanation John.
I'll certainly be holding high iron glazes at 1600F (down firing) for
an hour or so to see if I can repeat this.
On Thu, 15 Apr 2010 16:47:21 -0400, you wrote:
>Hi Adron,
>
>That glaze has a lot of iron oxide in it. That is just iron red you are =
=3D
seeing. A number of high iron glazes will go red if cooled very slowly or=
=3D
refired to bisque temperature or higher. You can usually get the effect =
=3D
with a single firing if you will hold for a couple hours at about 1600F =3D
on the way down.
>
>Regards,
>
>John
>
>On Apr 15, 2010, at 12:27 PM, Adron Lilly wrote:
>
>> I've been experimenting with the cone 6 glazes in John and Ron's book
>> (great book!) and have had their glaze called "Waterfall" develop a
>> bit of red, along with the usual crystals.
>>=3D20
>> http://tinyurl.com/yylx9ql
>>=3D20
>> My question is; How does the red develop in oxidation?
>=3D20
>> Adron
John Hesselberth on thu 15 apr 10
Hi Adron,
That glaze has a lot of iron oxide in it. That is just iron red you are =3D
seeing. A number of high iron glazes will go red if cooled very slowly =3D
or refired to bisque temperature or higher. You can usually get the =3D
effect with a single firing if you will hold for a couple hours at about =
=3D
1600F on the way down.
Regards,
John
On Apr 15, 2010, at 12:27 PM, Adron Lilly wrote:
> I've been experimenting with the cone 6 glazes in John and Ron's book
> (great book!) and have had their glaze called "Waterfall" develop a
> bit of red, along with the usual crystals.
>=3D20
> http://tinyurl.com/yylx9ql
>=3D20
> My question is; How does the red develop in oxidation?
>=3D20
> I fired the kiln with the top peep hole open and the downdraft vent
> running so had plenty of air.
>=3D20
> The picture is of the area inside the foot ring of a porcelain (Mile
> High "Aspen" body) bowl.
>=3D20
> The bowl was fired twice to cone 6 with slow cooling both times, the
> red appeared after the second firing.
>=3D20
> Adron
Eric Hansen on thu 15 apr 10
Unless you post the recipe, I couldn't begin to guess. Try emailng me
off-list.
h a n s e n
On Thu, Apr 15, 2010 at 12:27 PM, Adron Lilly wrote:
> I've been experimenting with the cone 6 glazes in John and Ron's book
> (great book!) and have had their glaze called "Waterfall" develop a
> bit of red, along with the usual crystals.
>
> http://tinyurl.com/yylx9ql
>
> My question is; How does the red develop in oxidation?
>
> I fired the kiln with the top peep hole open and the downdraft vent
> running so had plenty of air.
>
> The picture is of the area inside the foot ring of a porcelain (Mile
> High "Aspen" body) bowl.
>
> The bowl was fired twice to cone 6 with slow cooling both times, the
> red appeared after the second firing.
>
> Adron
>
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