Jeanne Ormsby on sun 20 dec 09
Some shinos go white when applied thickly (you can see this where there are=
=3D
drip or overlaps).=3DA0 You might try a thinner application to see what ha=
pp=3D
ens.=3DA0=3D20
=3DA0
Jeanne
=3DA0
=3DA0
Date:=3DA0 =3DA0 Fri, 18 Dec 2009 12:56:56 -0500
From:=3DA0 =3DA0 Lou Raye Nichol
Subject: GLAZE PROBLEM - WHAT IS GOING ON?
Hi
I just mixed a new batch of orange carbon trap - recipe below. What I got
was something entirely different - in a firing that was well reduced and
produced good carbon trapping with other glazes, this turned out pure white
and it crazed. Any ideas of what might be making this happen. The redart di=
=3D
d
go into it.
4000 Neph Sy
120 Soda Ash
150 Kentucky Ball Clay
130 Feldspar NC-4
80 EPK
90 Spodumene
300 Cedar Heights Redart
Lou RayeLou Raye Nichol
Carbon Trapped Porcelain
919-303-5848
www.louraye.com
pots@louraye.com
=3D0A=3D0A=3D0A
tony clennell on sun 20 dec 09
Jeanne: It is always a lot more helpful when trying to see what a
material is doing to look at the formula in a percentage basis.
Your formula has nep syn as over 80% of the formula- no wonder it's
white. And your soda ash is a couple of percent which in my experience
is very low for a carbon trap glaze.
I think that 4000 you wrote down for the Nep Syn might well be a
transcription error. I'd think 400 is more like it. Another good
reason for always keeping your formula in percentage and adding up to
100 plus the colourants In this case the colourant being the Red Art.
May the soot be with you.
Cheers,
Tony
On Sun, Dec 20, 2009 at 8:55 AM, Jeanne Ormsby wr=
ote:
> Some shinos go white when applied thickly (you can see this where there a=
re drip or overlaps). You might try a thinner application to see what happ=
ens.
>
> Jeanne
>
>
> Date: Fri, 18 Dec 2009 12:56:56 -0500
> From: Lou Raye Nichol
> Subject: GLAZE PROBLEM - WHAT IS GOING ON?
>
> Hi
>
> I just mixed a new batch of orange carbon trap - recipe below. What I got
> was something entirely different - in a firing that was well reduced and
> produced good carbon trapping with other glazes, this turned out pure whi=
te
> and it crazed. Any ideas of what might be making this happen. The redart =
did
> go into it.
>
> 4000 Neph Sy
> 120 Soda Ash
> 150 Kentucky Ball Clay
> 130 Feldspar NC-4
> 80 EPK
> 90 Spodumene
> 300 Cedar Heights Redart
>
> Lou RayeLou Raye Nichol
> Carbon Trapped Porcelain
> 919-303-5848
> www.louraye.com
> pots@louraye.com
>
>
>
>
>
>
--
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