Edouard Bastarache Inc. on mon 13 dec 04
Hello all,
could someone lighten my lantern on "salt raku"?
Later,
"Ils sont fous ces quebecois"
Edouard Bastarache
Irreductible Quebecois
Indomitable Quebeker
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
www.sorel-tracy.qc.ca/~edouardb/Welcome.html
http://perso.wanadoo.fr/smart2000/index.htm
http://www.digitalfire.com/education/toxicity/
Eva Gallagher on mon 13 dec 04
Hi Brian,
I read you web article on salt raku last year and wanted to try it with our
guild kiln - however was told that it would ruin the soft bricks and it
would forever contaminate future pots. I didn't think that just a few times
would really make any difference. What do you think?
Eva Gallagher
Deep River Potters' Guild
(Oldest potters guild in Canada - est 1954)
----- Original Message -----
From: "brian"
To:
Sent: Monday, December 13, 2004 3:03 PM
Subject: Re: Salt raku
> On 13/12/04 Edouard wrote ....
> >Hello all,
> >
> >could someone lighten my lantern on "salt raku"?
>
> We use to do a lot of raku firings in the eighties.
> It seems to work best on unglazed surfaces
> Simply open the lid or door and throw or place salt into the kiln
> (standing up-wind of course). It use it as a surface design element
> which is combined with other areas of glaze.
> Quite different from traditional salt glazing there can be a variety
> of effects from spotty to fumed, dry surfaces.
>
> I seem to remember that Paul Soldner use to get some really good
> salt-fumed surfaces. Try to reference his work.
>
> An old article I wrote for from "NZ Potter" magazine illustrates a
> few ideas on this topic. We didn't have colour printing at the time
> hence b&w photos only.
> maybe I could update it with colour soon (when I get a few spare moments
...?.)
>
> click here http://www.gartside.info/rakupageone.htm
>
> Brian
> --
>
> Brian Gartside
> 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.
Edouard Bastarache Inc. on mon 13 dec 04
Brian,
thanks very much...
"Ils sont fous ces quebecois"
Edouard Bastarache
Irreductible Quebecois
Indomitable Quebeker
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
www.sorel-tracy.qc.ca/~edouardb/Welcome.html
http://perso.wanadoo.fr/smart2000/index.htm
http://www.digitalfire.com/education/toxicity/
brian on tue 14 dec 04
On 13/12/04 you wrote ....
>however was told that it would ruin the soft bricks and it
>would forever contaminate future pots. I didn't think that just a few times
>would really make any difference. What do you think?
Eva,
I think that the amount of salt that is used would have very little
effect on the walls of the kiln and if some surface glazing did take
place it would be unlikely to cause problems for later firings which
employ fully glazed pots. Certainly I would not hesitate to do
occasional salt fumings.
We used ceramic fibre in small kilns and fired hundreds of time in classes.
It did eventually get a bit "glazed"
What could happen is that the salt will fall on the shelf but this
also is of no significance of you use up those old and sometimes
broken shelves that most studios have around on the base of the kiln.
More on shelvesand salting.........Using only one shelf I find it
better to stack the pots and forms on top of each other even when
they are glazed, and plates and tiles leaning on a hard brick placed
in the middle.
At full heat this gives the opportunity to use develop tong skills
while placing each piece individually in a position (usually on top)
where quite controlled salting can take place. Vessels can be fired
on their side and turned over to salt.
I should remember to say that after each salting the lid or door is
closed for a short while.
What I enjoy about it is that each piece can be given individual treatment.
as a continuation of this surface designing in the fire.
I also continue the surface design by the placing the sawdust,grasses
etc in the places that needed it.
I have to admit that all this individual treatment of the surface
demands very quick and positive visual decisions to be made. There is
not a lot of time to think and the intuition can be an excellent
guide. Isn't that an integral part of this process......"winging it"
from moment to moment.....staying in the present, not "seeing" the
end until you get there? For some of us anyway!.
Finally, I want to acknowledge two people who I watched work in this
flowing intuitive way, and who had a great influence in this "low
fire" area of ceramics
....Joan Campbell of Western Australia and Paul Soldner of USA
--
Brian Gartside
http://www.gartside.info
Pukekohe, New Zealand
brian on tue 14 dec 04
On 13/12/04 Edouard wrote ....
>Hello all,
>
>could someone lighten my lantern on "salt raku"?
We use to do a lot of raku firings in the eighties.
It seems to work best on unglazed surfaces
Simply open the lid or door and throw or place salt into the kiln
(standing up-wind of course). It use it as a surface design element
which is combined with other areas of glaze.
Quite different from traditional salt glazing there can be a variety
of effects from spotty to fumed, dry surfaces.
I seem to remember that Paul Soldner use to get some really good
salt-fumed surfaces. Try to reference his work.
An old article I wrote for from "NZ Potter" magazine illustrates a
few ideas on this topic. We didn't have colour printing at the time
hence b&w photos only.
maybe I could update it with colour soon (when I get a few spare moments ...?.)
click here http://www.gartside.info/rakupageone.htm
Brian
--
Brian Gartside
http://www.gartside.info
Pukekohe, New Zealand
Steve Mills on tue 14 dec 04
Feed *Salku* into Google; the answer's there.
Cheers
Steve
Bath
UK
In message , Edouard Bastarache Inc. writes
>Hello all,
>
>could someone lighten my lantern on "salt raku"?
>
>
>
>Later,
>
>
>
>"Ils sont fous ces quebecois"
>Edouard Bastarache
>Irreductible Quebecois
>Indomitable Quebeker
>Sorel-Tracy
>Quebec
>edouardb@sorel-tracy.qc.ca
>www.sorel-tracy.qc.ca/~edouardb/Welcome.html
>http://perso.wanadoo.fr/smart2000/index.htm
>http://www.digitalfire.com/education/toxicity/
--
Steve Mills
Bath
UK
Edouard Bastarache Inc. on tue 14 dec 04
Steve,
thanks.
I found my answer at
http://www.ceramicstoday.com/articles/salku.htm
"Ils sont fous ces quebecois"
Edouard Bastarache
Irreductible Quebecois
Indomitable Quebeker
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
www.sorel-tracy.qc.ca/~edouardb/Welcome.html
http://perso.wanadoo.fr/smart2000/index.htm
http://www.digitalfire.com/education/toxicity/
----- Original Message -----
From: "Steve Mills"
To:
Sent: Tuesday, December 14, 2004 6:49 PM
Subject: Re: Salt raku
> Feed *Salku* into Google; the answer's there.
>
> Cheers
>
> Steve
> Bath
> UK
>
>
> In message , Edouard Bastarache Inc. writes
>>Hello all,
>>
>>could someone lighten my lantern on "salt raku"?
>>
>>
>>
>>Later,
>>
>>
>>
>>"Ils sont fous ces quebecois"
>>Edouard Bastarache
>>Irreductible Quebecois
>>Indomitable Quebeker
>>Sorel-Tracy
>>Quebec
>>edouardb@sorel-tracy.qc.ca
>>www.sorel-tracy.qc.ca/~edouardb/Welcome.html
>>http://perso.wanadoo.fr/smart2000/index.htm
>>http://www.digitalfire.com/education/toxicity/
>
> --
> Steve Mills
> Bath
> UK
>
> ______________________________________________________________________________
> 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.
>
>
Ivor and Olive Lewis on wed 15 dec 04
Dear Eva Gallagher,
Raku temperatures are only high enough to melt Sodium chloride. They
certainly do not reach the stage where the salt will readily turn into
a vapour.
It is not generally appreciated that crystals of sodium chloride have
a low tolerance to thermal shock, meaning that they react violently
when heated rapidly.
This causes them to disintegrate in a process called "Decrepitation".
Small, almost microscopic, fragments fly around the kiln (and out of
any open ports). Those that settle on hot ware soon melt and the fluid
salt is adsorbed into the porous hot clay.
The chemistry of the effects of salting Raku have not yet, as far as I
am aware, been defined. Which leaves a large question mark over the
durability of the product.
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
Eva Gallagher on thu 16 dec 04
Hi Ivor,
So what this means is that once the salt has melted, further firings will
not vaporize the brick covering at Raku temps. Right?
Eva
----- Original Message -----
From: "Ivor and Olive Lewis"
To:
Sent: Tuesday, December 14, 2004 7:29 PM
Subject: Re: Salt raku
> Dear Eva Gallagher,
> Raku temperatures are only high enough to melt Sodium chloride. They
> certainly do not reach the stage where the salt will readily turn into
> a vapour.
> It is not generally appreciated that crystals of sodium chloride have
> a low tolerance to thermal shock, meaning that they react violently
> when heated rapidly.
> This causes them to disintegrate in a process called "Decrepitation".
> Small, almost microscopic, fragments fly around the kiln (and out of
> any open ports). Those that settle on hot ware soon melt and the fluid
> salt is adsorbed into the porous hot clay.
> The chemistry of the effects of salting Raku have not yet, as far as I
> am aware, been defined. Which leaves a large question mark over the
> durability of the product.
> Best regards,
> Ivor Lewis.
> Redhill,
> S. Australia.
>
>
____________________________________________________________________________
__
> 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.
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