Mary Starosta on wed 8 oct 08
I have a white stoneware clay body fires cone 5-7. I fire to Cone ^6
Oxidation slow cool. I have a nice glossy,transparent, base glaze formula
that has been tested food safe, with a unity formula of
k20 0.075
na20 0.140
ca0 0.624
mgo 0.161
al203 0.357
b203 0.211
fe203 0.004
sio2 3.276
tio2 0.002
si:al 9.2:1
I want my designs on the bisqued clay, they were painted on during leather
hard and fired to cone 04 ox, to show through the glaze and it is great as
a clear but I want a *hint of blue green* so the body is not just white.
But not so much that my design underneath does not remain crisp. I don't
want the glaze creamy or mutted, need it to remain clear and glossy. What
should I begin to add to this base and test to try and reach this goal?
Thanks
Mary Starosta
Colorado Potter
http://marystarosta.wordpress.com/
Where the pumpkins are having chilly nights
James F on wed 8 oct 08
Mary..
The easiest thing to do may be to add mason stain. Do a line blend from pe=
rhaps 4% up to 10% by 2s. I did precisely this with a cone 6 clear. With =
all but the black and teal stains=2C the glaze remained transparent to tran=
slucent. Just to get you started=2C in my case 5% of green or yellow yield=
ed a very pale=2C very transparent glaze. 5% of teal was nearly opaque and=
quite saturated. Easy stuff!
All the best.
...James
> Date: Wed=2C 8 Oct 2008 06:58:51 -0600
> From: mastarosta@GMAIL.COM
> Subject: Blue green translucent Cone ^6 Ox Glaze
> To: CLAYART@LSV.CERAMICS.ORG
>=20
> I have a white stoneware clay body fires cone 5-7. I fire to Cone ^6
> Oxidation slow cool. I have a nice glossy=2Ctransparent=2C base glaze fo=
rmula
> that has been tested food safe=2C with a unity formula of
> k20 0.075
> na20 0.140
> ca0 0.624
> mgo 0.161
> al203 0.357
> b203 0.211
> fe203 0.004
> sio2 3.276
> tio2 0.002
> si:al 9.2:1
> I want my designs on the bisqued clay=2C they were painted on during leat=
her
> hard and fired to cone 04 ox=2C to show through the glaze and it is grea=
t as
> a clear but I want a *hint of blue green* so the body is not just white.
> But not so much that my design underneath does not remain crisp. I don't
> want the glaze creamy or mutted=2C need it to remain clear and glossy. W=
hat
> should I begin to add to this base and test to try and reach this goal?
> Thanks
> Mary Starosta
> Colorado Potter
> http://marystarosta.wordpress.com/
> Where the pumpkins are having chilly nights
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Want to do more with Windows Live? Learn =9310 hidden secrets=94 from Jamie=
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May Luk on wed 8 oct 08
Hello Mary;
0.5 % - 2% copper carb, or a pale turq stain like robins egg stain [6376- M=
ason Stain] would do. Or both together. It's professor line blend time! The=
copper carb probably turn turq in your glaze composition. They also might =
stain your clay to a more yellow tint.
What color and material is your painting pigment? Is it bleeding now in the=
clear glaze?
May
Brooklyn NY
--- On Wed, 8/10/08, Mary Starosta wrote:
> From: Mary Starosta
> Subject: Blue green translucent Cone ^6 Ox Glaze
> To: CLAYART@LSV.CERAMICS.ORG
> Date: Wednesday, 8 October, 2008, 1:58 PM
> I have a white stoneware clay body fires cone 5-7. I fire
> to Cone ^6
> Oxidation slow cool. I have a nice glossy,transparent,
> base glaze formula
> that has been tested food safe, with a unity formula of
> k20 0.075
> na20 0.140
> ca0 0.624
> mgo 0.161
> al203 0.357
> b203 0.211
> fe203 0.004
> sio2 3.276
> tio2 0.002
> si:al 9.2:1
> I want my designs on the bisqued clay, they were painted on
> during leather
> hard and fired to cone 04 ox, to show through the glaze
> and it is great as
> a clear but I want a *hint of blue green* so the body is
> not just white.
> But not so much that my design underneath does not remain
> crisp. I don't
> want the glaze creamy or mutted, need it to remain clear
> and glossy. What
> should I begin to add to this base and test to try and
> reach this goal?
> Thanks
> Mary Starosta
> Colorado Potter
> http://marystarosta.wordpress.com/
> Where the pumpkins are having chilly nights =0A=0A=0A
Josh Berkus on wed 8 oct 08
Mary,
> I want my designs on the bisqued clay, they were painted on during
> leather hard and fired to cone 04 ox, to show through the glaze and it
> is great as a clear but I want a *hint of blue green* so the body is not
> just white. But not so much that my design underneath does not remain
> crisp. I don't want the glaze creamy or mutted, need it to remain clear
> and glossy. What should I begin to add to this base and test to try and
> reach this goal? Thanks
Copper Oxide (0.7 to 1.5%) and cobalt carbonate (0.1 to 0.5%) is where I'd
start. And please let us know how it goes.
--
Josh Berkus
San Francisco
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