William & Susan Schran User on tue 12 sep 06
A few folks contacted me about the ^6 iron red glazed pot on my web site.
I decided not to include the recipe on my web site because it is not a
stable glaze for functional ware.
It is a glaze that was listed as part of an article in Ceramics Monthly
several years ago as part of an investigation in creating iron reds at ^6 in
an oxidation firing.
Here's the recipe:
^6 Iron Red
Gerstley Borate - 54.88
Talc - 14.63
Silica - 30.49
Red Iron Oxide - 21.95
As you can see, this glaze contains no clay, relying on the GB to hold it in
suspension.
I would usually add a couple tablespoons of soda ash to large batches to
keep the glaze from gelling too much.
A second firing at bisque temps (usually just included some pots in a bisque
firing) would yield more reddish colors.
-- William "Bill" Schran
Fredericksburg, Virginia
wschran@cox.net
wschran@nvcc.edu
Ron Roy on wed 13 sep 06
I like Bills attitude about giving the information about this glaze - if I
could just add a few comments to expand on what he has said.
The expansion of this glaze - without the iron - is very low - some might
be tempted to use it as a clear glaze or just add a small amount of
colouring oxide. In that case it would be wise to test carefully for
shivering and dunting on any clay bodies you are using and on any new clay
bodies you start using.
RR
>A few folks contacted me about the ^6 iron red glazed pot on my web site.
>
>I decided not to include the recipe on my web site because it is not a
>stable glaze for functional ware.
>
>It is a glaze that was listed as part of an article in Ceramics Monthly
>several years ago as part of an investigation in creating iron reds at ^6 in
>an oxidation firing.
>
>Here's the recipe:
>
>^6 Iron Red
>Gerstley Borate - 54.88
>Talc - 14.63
>Silica - 30.49
>Red Iron Oxide - 21.95
>
>As you can see, this glaze contains no clay, relying on the GB to hold it in
>suspension.
>I would usually add a couple tablespoons of soda ash to large batches to
>keep the glaze from gelling too much.
>
>A second firing at bisque temps (usually just included some pots in a bisque
>firing) would yield more reddish colors.
>
>
>-- William "Bill" Schran
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
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