[Clayart] Iron

Antoinette Badenhorst porcelainbyantoinette at gmail.com
Tue Jul 18 10:32:16 EDT 2017

Thank you to those of you that took the time to answer. I do not have a
conclusion of why this turned out brown yet. Will use new iron and test.

One of you mentioned the bone ash - artificial versus real, which raised
the question with me if the bone ash may "expire", since I used the real

As I mentioned before: I used the exact same materials that I used on
porcelain before. All these (except the silica and maybe the custer) came
from batches that I had in my studio for the best part of 15-18 years. (yes
I have some valuable materials.....)

The recipe is no secret, it is similar to many others available online, but
the reason I want to do it again is because over time some of the plates
that I glazed with it wore off, which told me that there is maybe not
enough silica in this recipe. So I want to alter it some, but first need to
make sure I have the color right.

* Ralph’s Terracotta.*

Custer F.                           41

Talc                                     9

Bone ash                          13

Lith Carb.                            2

Kentucky Ball clay            13

Silica                                 13


Iron ox                                 9

Anyone else have some input? I will appreciate that.

On Sat, Jul 15, 2017 at 6:06 AM, Paul Gerhold <gerholdclay at gmail.com> wrote:

> Antoinette,
> Iron oxide does not change under any conditions that your supply would
> experience. I have been using the same supply of RIO for thirty plus years
> and no changes have occurred.  Probably a problem with some other chemical.
> Paul
> Sent from my iPad
> > On Jul 13, 2017, at 8:20 PM, Porcelain byAntoinette <
> porcelainbyantoinette at gmail.com> wrote:
> >
> > Hi guys. I have mixed up a iron red glaze that I did not mix for a
> while. I used ingredients that is 10 years old and older end the end result
> was a flat brown instead of the reach read brown that it was before.
> > I repeated the recipe, thinking I made a mistake, ending up with the
> same results.
> > Then I thought maybe I used the wrong recipe and compared it with
> similar recipes getting to the conclusion that I did not make a mistake.
> > So someone said the problem is the iron that changed over time. This was
> the first time I heard that in all the 36+ years I am in clay. Is that true
> and if so, can I fix it? I assume that if that is true, it has to do with
> the oxidation process.
> > Antoinette Badenhorst.
> >
> > Sent from my iPhone


Antoinette Badenhorst

PorcelainByAntoinette <http://www.porcelainbyantoinette.com/>


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