Gary Brown on fri 9 feb 01
Is it safe to refire (raku) a pot that has been rakued once and sprayed
with ferric chloride? Tried to do the horsehair but it was too hot and only
got
a few black marks; but it was sprayed lightly with the ferric chloride.
Will the
f.c. be flammable in the refiring--has anyone tried this? I was never too
good at science and do not want to create anything dangerous.
Thanks,
E Brown
Bayou Pottery
Dickinson,TX
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Larry Phillips on sat 10 feb 01
Cantello Studios wrote:
>
> I have been keeping up on this thread and wonder if some can
> describe the effect that ferric chloride has on a pot that is just
> raw clay.
Have a look at http://24.113.44.106/larry/
Follow the links to Fraser Valley Potters Guild, then Workshops, Randy
Brodnax, and take a look at page 3 of the picture thumbnails. Pictures
105, 110, and 111 are unglazed pots, while 117-121 are glazed. Horsehair
and Ferric Chloride does work on glaze, though with some differences. I
love the effect on a crackle white. Your question prompted me to put up
a picture of a recent pot with glazed and unglazed areas, Ferric
Chloride spray, and some carbon markings. You can see it uner 'Hobbies
and Links / The Gallery / Larry Phillips'.
--
Procrastinate now!
http://24.113.44.106/larry/
Roger Korn on sat 10 feb 01
E. Brown wrote...
Is it safe to refire (raku) a pot that has been rakued once
and sprayed
with ferric chloride? Tried to do the horsehair but it was too
hot and only
got a few black marks; but it was sprayed lightly with the
ferric chloride.
Will the f.c. be flammable in the refiring--has anyone tried
this? I was never too
good at science and do not want to create anything dangerous.
Not a problem, if there's good ventilation. Spraying FeCl2 (Moss Killer
at Home Depot) will possibly produce some hydrochloric acid (HCl) fumes,
but I've never detected any. The trick with the horsehair is to slowly
let the pot cool until you get optimum marking. I'll take the pot out of
the kiln and set it on a firebrick and play with the horsehair, ferric
chloride spray, and a weed burner (low flame) until things work
properly. You want to use a fairly open, groggy raku clay or you may get
cracking, but the directness of fooling around with the piece outside of
the kiln is a lot of fun. Use gloves, mask, stand upwind, etc.
Roger Korn
McKay Creek Ceramics
Cantello Studios on sat 10 feb 01
I have been keeping up on this thread and wonder if some can describe the
effect that ferric chloride
has on a pot that is just raw clay. What I'm trying to ask is if this is
being used in horse hair type work
the pot has no glaze on it, so its raw clay. I know that it's been bisque
fired once and burnish
and then reheated to apply the horse hair, but what is the color you get
from the spraying of the
Ferric chloride. Ferric is Iron I think and iron could make
yellow,red,brown,black could some one talk
about the color. And has anyone ever tried any other fuming techniques that
are used in glass. Chris
Marcia Selsor on sun 11 feb 01
I have used ferric chloride to fume raku coming out the kiln and going
into the combustion chamber. It gives a gold luster to crakel white.
(Stannous Chloride gives rainbow luster) Both are toxic.
I have used ferric chloride as a spray onto unglazed terra cotta pieces
using a torch. This gave some interesting flash marks to otherwise dull
surface (over fired my Terra Sig).
It gives warmer tones. Be sure to be away from the toxic fumes.
Marcia in Montana
Cantello Studios wrote:
>
> I have been keeping up on this thread and wonder if some can describe the
> effect that ferric chloride
> has on a pot that is just raw clay. What I'm trying to ask is if this is
> being used in horse hair type work
> the pot has no glaze on it, so its raw clay. I know that it's been bisque
> fired once and burnish
> and then reheated to apply the horse hair, but what is the color you get
> from the spraying of the
> Ferric chloride. Ferric is Iron I think and iron could make
> yellow,red,brown,black could some one talk
> about the color. And has anyone ever tried any other fuming techniques that
> are used in glass. Chris
>
> ______________________________________________________________________________
> 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.
--
Marcia Selsor
selsor@imt.net
http://www.imt.net/~mjbmls
http://www.imt.net/~mjbmls/Tuscany2001.html
Jennifer Firestone on sun 11 feb 01
Chris,
The ferric chloride can give you anywhere from yellow to very dark red/brown
depending on how strong you mix it before spraying it on a bisqued pot. If
you spray long enough or over a dark clay body you can build up some
iridescence. I've also used it over bisque pots sprayed with various color
underglazes before firing to temp for the horsehair & fuming, & sprayed it
on crackle glazed pots so lots of variations available! There are some
ferric chloride fumed horsehair pots on my website:
http://members.aol.com/firekit
just click on horsehair in the left bar.They are the not white or pink ones.
A word of CAUTION: ferric chloride is extremely caustic! Don't breathe the
fumes or drip it on anything !
I too would be interested in any info on fuming with other
chemicals. I know a friend of mine had some success with blue food
coloring......try everything.......
Most all of my info on horsehair & fuming came from Randy
Broadnax.........if you ever get a chance to go to one of his workshops grab
it!!
best regards,
Jennifer
South of Houston, TX where the TCAA show opens 2/17
----- Original Message -----
From: "Cantello Studios"
Sent: Saturday, February 10, 2001 1:32 PM
Subject: Re: refire ferric chloride
> I have been keeping up on this thread and wonder if some can describe the
> effect that ferric chloride
> has on a pot that is just raw clay. What I'm trying to ask is if this is
> being used in horse hair type work
> the pot has no glaze on it, so its raw clay. I know that it's been bisque
> fired once and burnish
> and then reheated to apply the horse hair, but what is the color you get
> from the spraying of the
> Ferric chloride. Ferric is Iron I think and iron could make
> yellow,red,brown,black could some one talk
> about the color. And has anyone ever tried any other fuming techniques
that
> are used in glass. Chris
>
craig clark on sun 11 feb 01
Roger, I've never sprayed any ferric chloride but have been considering
doing so. I asked my wife, the chemistry teacher, about the HCL and she
said, " yeah....that could definitlely be a problem. You'd better wear some
type of repirator." FWIW
Craig Clark
-----Original Message-----
From: Roger Korn
To: CLAYART@LSV.CERAMICS.ORG
Date: Saturday, February 10, 2001 11:31 AM
Subject: Re: refire ferric chloride
> E. Brown wrote...
>
> Is it safe to refire (raku) a pot that has been rakued once
> and sprayed
> with ferric chloride? Tried to do the horsehair but it was too
> hot and only
> got a few black marks; but it was sprayed lightly with the
> ferric chloride.
> Will the f.c. be flammable in the refiring--has anyone tried
> this? I was never too
> good at science and do not want to create anything dangerous.
>
>
>Not a problem, if there's good ventilation. Spraying FeCl2 (Moss Killer
>at Home Depot) will possibly produce some hydrochloric acid (HCl) fumes,
>but I've never detected any. The trick with the horsehair is to slowly
>let the pot cool until you get optimum marking. I'll take the pot out of
>the kiln and set it on a firebrick and play with the horsehair, ferric
>chloride spray, and a weed burner (low flame) until things work
>properly. You want to use a fairly open, groggy raku clay or you may get
>cracking, but the directness of fooling around with the piece outside of
>the kiln is a lot of fun. Use gloves, mask, stand upwind, etc.
>
>Roger Korn
>McKay Creek Ceramics
>
>___________________________________________________________________________
___
>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.
>
Gary Elfring on tue 13 feb 01
At 12:00 AM 2/10/01 -0500, you wrote:
>Is it safe to refire (raku) a pot that has been rakued once and sprayed
>with ferric chloride? Tried to do the horsehair but it was too hot and only
>got a few black marks; but it was sprayed lightly with the ferric chloride.
>Will the f.c. be flammable in the refiring--has anyone tried this? I was
>never too
>good at science and do not want to create anything dangerous.
Define safe!
Yes you can refire it. BUT, depending on how high you heat it and how quickly
it is cooled, the color will change. It will probably end up red-brown or
orange-red.
Elfring Fonts, Inc Bar Codes, MICR, and decorative fonts for Windows
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