Kathy Forer on mon 2 feb 04
What happens when clay that has rust (from nails) is fired?
Is it just iron oxide, as from Mars, and it changes a buff clay into a
red clay, or does it do more? Would pieces of rusty clay spit or blow
out of a solid body?
What other natural materials can be mixed into clay as colorants?
If this is a very naive question, my apologies.
Kathy
Kathy Forer
http://kforer.com
Craig Edwards on mon 2 feb 04
Hello Kathy: I've had an occasional piece of iron get through the
firing. They melt and run abit if they are larger chunks. Depending on
the size of the iron particles. If the particle size is small you just
get iron spots. It would have to be 80-100 mesh size or finer and evenly
dispersed to turn your clay to red. Sometimes the results are
interesting and charming, other times just the opposite.
Cheers
Craig Edwards
New London MN
http://www.livejournal.com/~smilingpotter/
Kathy Forer wrote:
> What happens when clay that has rust (from nails) is fired?
> Is it just iron oxide, as from Mars, and it changes a buff clay into a
> red clay, or does it do more? Would pieces of rusty clay spit or blow
> out of a solid body?
>
> What other natural materials can be mixed into clay as colorants?
>
> If this is a very naive question, my apologies.
>
> Kathy
>
>
> Kathy Forer
> http://kforer.com
>
> ______________________________________________________________________________
>
> Send postings to clayart@lsv.ceramics.org
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> melpots@pclink.com.
>
Ron Roy on mon 2 feb 04
Hi Kathy - there are chunks of iron in fire clay - sometimes potters add
iron for specking - it will not be a problem unless they are too big - head
of a pin is a big as I would go.
RR
>What happens when clay that has rust (from nails) is fired?
>Is it just iron oxide, as from Mars, and it changes a buff clay into a
>red clay, or does it do more? Would pieces of rusty clay spit or blow
>out of a solid body?
>
>What other natural materials can be mixed into clay as colorants?
>
>If this is a very naive question, my apologies.
>
>Kathy
>
>
>Kathy Forer
>http://kforer.com
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Earl Brunner on mon 2 feb 04
If you high fire and the fust is chunky, then you will
get melted drips in proportion to the amount of iron.
If it is granular, you will get specks. That's the
"simple" answer, reduction and temperature all play a
factor.
--- Kathy Forer wrote:
> What happens when clay that has rust (from nails) is
> fired?
> Is it just iron oxide, as from Mars, and it changes
> a buff clay into a
> red clay, or does it do more? Would pieces of rusty
> clay spit or blow
> out of a solid body?
>
> What other natural materials can be mixed into clay
> as colorants?
>
> If this is a very naive question, my apologies.
>
> Kathy
>
>
> Kathy Forer
> http://kforer.com
>
>
______________________________________________________________________________
> 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.
=====
Earl Brunner
e-mail: brunv53@yahoo.com
David Hendley on mon 2 feb 04
Rust scale is a great addition to clay for iron spots. I have used
it many times. Of course the effect will be more pronounced
in a reduction firing.
For a nice specked effect, you need to screen the rust particles
and throw away those that are too fine or too coarse (or grind them
smaller). I use a 30 or 40 mesh sieve to keep out the pieces that are
too big, then put them through a 60 or 80 mesh sieve, keeping only
what does not make it through the screen, to remove the fine powder.
By 'natural materials' I guess you mean found materials, since
rust from nails is no more or less natural than something you might buy
at the ceramics supply store.
Copper specks in a claybody can be interesting - they can actually
make red spots appear when glazed with a celadon-type glaze.
A good source is the key duplicating machine at the hardware store.
Just ask them if you can clean out the filings under the machine, or,
if you are on friendly terms, to save them for you for a few weeks.
You might want to wear gloves, since there can be some sharp
larger pieces.
David Hendley
david@farmpots.com
http://www.farmpots.com
--- Original Message -----
> What happens when clay that has rust (from nails) is fired?
> Is it just iron oxide, as from Mars, and it changes a buff clay into a
> red clay, or does it do more? Would pieces of rusty clay spit or blow
> out of a solid body?
>
> What other natural materials can be mixed into clay as colorants?
Ababi Sharon on tue 3 feb 04
I add brass chips to paperclay body. In ox it is green and gray under
white glaze. I raku it has been copper color.
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://ababi.active.co.il
http://www.matrix2000.co.nz/Matrix%20Demo/Ababi.htm
Ceramics forum in Hebrew:
http://community.msn.co.il/comm_forum_topics.asp?ForumID=7894&PagePositi
on=1&ThreadPage=1&CommID=4804
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of David
Hendley
Sent: Tuesday, February 03, 2004 2:50 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: rust in clay
Rust scale is a great addition to clay for iron spots. I have used
it many times. Of course the effect will be more pronounced
in a reduction firing.
For a nice specked effect, you need to screen the rust particles
and throw away those that are too fine or too coarse (or grind them
smaller). I use a 30 or 40 mesh sieve to keep out the pieces that are
too big, then put them through a 60 or 80 mesh sieve, keeping only
what does not make it through the screen, to remove the fine powder.
By 'natural materials' I guess you mean found materials, since
rust from nails is no more or less natural than something you might buy
at the ceramics supply store.
Copper specks in a claybody can be interesting - they can actually
make red spots appear when glazed with a celadon-type glaze.
A good source is the key duplicating machine at the hardware store.
Just ask them if you can clean out the filings under the machine, or,
if you are on friendly terms, to save them for you for a few weeks.
You might want to wear gloves, since there can be some sharp
larger pieces.
David Hendley
david@farmpots.com
http://www.farmpots.com
--- Original Message -----
> What happens when clay that has rust (from nails) is fired?
> Is it just iron oxide, as from Mars, and it changes a buff clay into a
> red clay, or does it do more? Would pieces of rusty clay spit or blow
> out of a solid body?
>
> What other natural materials can be mixed into clay as colorants?
________________________________________________________________________
______
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.
Brian on tue 3 feb 04
On 2/2/04,Kathy wrote...
>What happens when clay that has rust (from nails) is fired?
>
>What other natural materials can be mixed into clay as colorants?
A few years ago we tried some experiments mixing all kinds of unusual
ingredients in the clay including quarry dust,rock salt, beach
shingle, crushed sea shells, iron sand and cement.
There are pictures and an article about this.......
try http://www.gartside.info/sickofslickchart.htm
There was not a great deal of colour generated but many natural
materials in the clay yielded some erratic and striking glaze
textures.
Brian
--
Brian
http://www.gartside.info
Pukekohe, New Zealand
Kathy Forer on mon 9 feb 04
Brian,
Thanks for letting me know about the terrific chart, it's very
broadening.
Your work is really nice. I particularly like the wall sculptures :)
Are they painted or glazed?
Take care,
Kathy
On Feb 2, 2004, at 2:47 PM, Brian wrote:
> On 2/2/04,Kathy wrote...
>> What happens when clay that has rust (from nails) is fired?
>>
>> What other natural materials can be mixed into clay as colorants?
>
> A few years ago we tried some experiments mixing all kinds of unusual
> ingredients in the clay including quarry dust,rock salt, beach
> shingle, crushed sea shells, iron sand and cement.
> There are pictures and an article about this.......
> try http://www.gartside.info/sickofslickchart.htm
> There was not a great deal of colour generated but many natural
> materials in the clay yielded some erratic and striking glaze
> textures.
>
> Brian
>
>
>
> --
>
> Brian
> http://www.gartside.info
> Pukekohe, New Zealand
>
> _______________________________________________________________________
> _______
> 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.
>
Kathy Forer on mon 9 feb 04
Amazing what can be added to clay and how it changes it. Though I
attended an elementary materials lecture on clay and ceramics chemistry
once, most of my clay-additive experience "as a sculpture student" was
geared toward keeping plaster and other 'foreign' materials out of
clay, not mixing them in to achieve varied textures and effects.
There's so much to learn!
Thank you,
Kathy
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