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iron in clay and the effects on glazes (speckles)

updated sun 14 jan 07

 

Lisa E on thu 11 jan 07


Hi All;

I currently use Seattle Sea Mix 5 as it is very forgiving to a new potter
such as myself. I can really push the limits whether on the wheel or
hand-building and I never have a problem with cracking or handles, etc. It
bisque fires to a nice white.

BUT I have noticed that some clays which are high in iron gives glazes an
interesting effect with speckles. I fire 6^ and mainly using MC6G High
Calcium Semimatt base 1 & 2.

Does anyone know of a high iron clay which will give me speckles?

Thank you in advance!
--
Lisa E
Sunny Daze Design Pottery Studio
SunnyDazeDesign@gmail.com
Squamish, BC Canada

www.lisaelbertsen.com
http://picasaweb.google.com/SunnyDazeDesign

Erik Harmon on fri 12 jan 07


Standard Ceramics makes a speckled clay, but I think its granular manganese.

Lisa E wrote: Hi All;

I currently use Seattle Sea Mix 5 as it is very forgiving to a new potter
such as myself. I can really push the limits whether on the wheel or
hand-building and I never have a problem with cracking or handles, etc. It
bisque fires to a nice white.

BUT I have noticed that some clays which are high in iron gives glazes an
interesting effect with speckles. I fire 6^ and mainly using MC6G High
Calcium Semimatt base 1 & 2.

Does anyone know of a high iron clay which will give me speckles?

Thank you in advance!
--
Lisa E
Sunny Daze Design Pottery Studio
SunnyDazeDesign@gmail.com
Squamish, BC Canada

www.lisaelbertsen.com
http://picasaweb.google.com/SunnyDazeDesign

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Lisa E on fri 12 jan 07


Awesome! Thanks Steve. Lisa

On 1/11/07, claystevslat wrote:
>
> Lisa --
>
> Goldstone, a ^6 clay also available from Seattle Pottery Supply.
> Has speckles in it (I suspect it's manganese) that 'blur' with
> some glazes, and the dark brownish color bleeds through even some
> fairly opaque glazes. Has some interesting effects, it makes
> my yellow glaze go clear. Even easier to throw than Sea Mix though
> it's a bit more abrasive.
>
> I do find the high calcium semi-matte glazes are more to my
> taste over white stoneware. A darker or speckled clay may encourage
> you to pursue different directions.
>
> -- Steve Slatin
>
> --- In clayart@yahoogroups.com, Lisa E wrote:
> >
> > Hi All;
> >
> > I currently use Seattle Sea Mix 5 as it is very forgiving to a new
> potter
> > such as myself. I can really push the limits whether on the wheel
> or
> > hand-building and I never have a problem with cracking or handles,
> etc. It
> > bisque fires to a nice white.
> >
> > BUT I have noticed that some clays which are high in iron gives
> glazes an
> > interesting effect with speckles. I fire 6^ and mainly using MC6G
> High
> > Calcium Semimatt base 1 & 2.
> >
> > Does anyone know of a high iron clay which will give me speckles?
>
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
> melpots@pclink.com.
>



--
Lisa E
Sunny Daze Design Pottery Studio
SunnyDazeDesign@gmail.com
Squamish, BC Canada

www.lisaelbertsen.com http://picasaweb.google.com/SunnyDazeDesign

claystevslat on fri 12 jan 07


Lisa --

Goldstone, a ^6 clay also available from Seattle Pottery Supply.
Has speckles in it (I suspect it's manganese) that 'blur' with
some glazes, and the dark brownish color bleeds through even some
fairly opaque glazes. Has some interesting effects, it makes
my yellow glaze go clear. Even easier to throw than Sea Mix though
it's a bit more abrasive.

I do find the high calcium semi-matte glazes are more to my
taste over white stoneware. A darker or speckled clay may encourage
you to pursue different directions.

-- Steve Slatin

--- In clayart@yahoogroups.com, Lisa E wrote:
>
> Hi All;
>
> I currently use Seattle Sea Mix 5 as it is very forgiving to a new
potter
> such as myself. I can really push the limits whether on the wheel
or
> hand-building and I never have a problem with cracking or handles,
etc. It
> bisque fires to a nice white.
>
> BUT I have noticed that some clays which are high in iron gives
glazes an
> interesting effect with speckles. I fire 6^ and mainly using MC6G
High
> Calcium Semimatt base 1 & 2.
>
> Does anyone know of a high iron clay which will give me speckles?