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glaze problem - what is going on?

updated sat 19 dec 09

 

Lou Raye Nichol on fri 18 dec 09


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=
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

William & Susan Schran User on fri 18 dec 09


On 12/18/09 12:56 PM, "Lou Raye Nichol" >
wrote:

> 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.

Lou Raye,
The last sentence answered your question: " The redart did go into it."
The redart being your primary source of iron.

Bill

--
William "Bill" Schran
wschran@cox.net
wschran@nvcc.edu
http://www.creativecreekartisans.com