May Luk on fri 23 may 03
I am going to participate in a raku firing in a few weeks. This will be my
second time.
1-I'd like to experiment with mid range porcelain clay and / or
semi-porcelain (1250 C appox, I got some reclaim from my studio colleague).
Is this a possibility?
2-If porcelain is possbile. What's the percentage of grog (or calcined china
clay?) to add in? What is the bisque temperature?
3-Should I be concerned with glaze? I have 2 simple recipes with Borax frit,
whiting & china clay. Can I stick with that? Wanna keep it simple.
I have looked up some books and from what I read, quickly, is that the
delicate porcelain and the violent nature of the raku process don't mix. But
I'm feeling adventurous and would like to hear from the more experienced.
Thank you in advance
Best Regards
May
London, UK
Rare - Earth - Design on fri 23 may 03
May,
I have had 100% success with the Limoges high firing (1400 Celsius) =
porcelain
body without any additions in, pit-firings, raku firings and just to see =
what would=20
happen I poured and dipped oxides onto and into a couple of bowls and =
turned a
blow-torch onto them. They were placed on concrete and they took =
everything I=20
did to them and withstood it all, no additions to the body, but they =
were thrown thin,
approx. 12 inches diameter and 4 inches high.
I read lots of books, but never any about pottery unless they are =
strictly pictorial, like=20
"Smashing Pots Feats of Clay".
Regards,
Bob Hollis
----- Original Message -----=20
From: "May Luk"
>=20
> 1-I'd like to experiment with mid range porcelain clay and / or
> semi-porcelain (1250 C appox, I got some reclaim from my studio =
colleague).
> Is this a possibility?
>=20
> 2-If porcelain is possbile. What's the percentage of grog (or calcined =
china
> clay?) to add in? What is the bisque temperature?
>=20
> 3-Should I be concerned with glaze? I have 2 simple recipes with Borax =
frit,
> whiting & china clay. Can I stick with that? Wanna keep it simple.
>=20
> I have looked up some books and from what I read, quickly, is that the
> delicate porcelain and the violent nature of the raku process don't =
mix. But
> I'm feeling adventurous and would like to hear from the more =
experienced.
>=20
> Thank you in advance
>=20
> Best Regards
> May
>
Haaland, Rodney S. on fri 23 may 03
I have had fairly good success with a cone 6 porcelain I have used in raku
firings. I used the same raku glaze I use for the raku body I use. I found
it to be quite robust against thermal shock. The craze pattern was larger. I
also found that a wash of CuCO3/Fe2O3/MnO applied with a brush over the
glaze worked to produce nice flashes of copper.
Good luck.
Rod
-----Original Message-----
From: May Luk [mailto:yamerica@BTOPENWORLD.COM]
Sent: Friday, May 23, 2003 10:32 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Porcelain: can you raku?
I am going to participate in a raku firing in a few weeks. This will be my
second time.
1-I'd like to experiment with mid range porcelain clay and / or
semi-porcelain (1250 C appox, I got some reclaim from my studio colleague).
Is this a possibility?
2-If porcelain is possbile. What's the percentage of grog (or calcined china
clay?) to add in? What is the bisque temperature?
3-Should I be concerned with glaze? I have 2 simple recipes with Borax frit,
whiting & china clay. Can I stick with that? Wanna keep it simple.
I have looked up some books and from what I read, quickly, is that the
delicate porcelain and the violent nature of the raku process don't mix. But
I'm feeling adventurous and would like to hear from the more experienced.
Thank you in advance
Best Regards
May
London, UK
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Dannon Rhudy on fri 23 may 03
May Luk said:
> I am going to participate in a raku firing............
I'd like to experiment with mid range porcelain clay .
...... What's the percentage of grog (or calcined china
> clay?) .........
I have fired porcelain claybodies in raku firings. Of
course, when you are done, it is not really porcelain,
the clay has not vitrified, and will be prone to chipping.
Porcelain clays are generally pretty tight bodies, so they
tend to crack in firing, or when taken from the kiln, when
cooling. I've done it successfully, but it is more time
consuming, and there is no real advantage to it.
Your best chances for success (i.e., pieces that don't
crack during the process) would be small pieces. If you
just want a white clay, there are bodies better adapted
for the process.
regards
Dannon Rhudy
Ababi on sat 24 may 03
As a matter of fact I added 10% Nepheline Syenite but I did it because of another
reason. You can try and add it or if you want to make more serious test you can add
to each K'g or to each lump of 2 pounds weigh it as dry or as soft, just remember how
you have done it. Can add 5 frit or ten 5 or Nepheline Syenite or another frit. Gerstley
borate or talc. If you will add talc - blue glazes will be looked violet see here
http://members4.clubphoto.com/ababi306910/838890/
The slide:
I add here the recipe of this claybody got from John Brit and keep it in the mail
somewhere wait....
... I found in the Clayart archives
>
>Date: Wed, 9 May 2001 18:48:07 -0500
>Reply-To: Ceramic Arts Discussion List
>Sender: Ceramic Arts Discussion List
>From: Clay Coordinator
>Subject: Re: Porcelain Raku Body
>Content-Type: text/plain; charset="iso-8859-1"
>Bruce,
>I have got a great Porcelain Raku Body.
>I think it is from Nicholas Bernard. It was in an old CM, but I forgot the
>date.
>The parts recipe is:
>EPK -150 Ababi: Do not use English kaolin it is not plastic better use from
France.
>OM-4 -60 Ababi: Use ball clay AK or similar
>Wollastonite - 25
>Talc - 5
>Macaloid -1 Ababi: Can use Bentonite
>Grog 50 Ababi : I used fine grog
>Mix with 1 gallon of cider vinegar and age. Ababi: Beer will be good too
>It is a great white body. I use fine/medium grog. You can up the macaloid
>if you like to 2 parts. It has served me well.
>Thanks,
>John Britt
>Penland Clay Coordinator
=============================================
It is a very sensitive claybody.
Be carful when using it Does not work good with an extruder. The ware in my site
was fired twice.
The other claybody I used was based , almost the same, A recipe by Val Cushing.
I used 40 kaolin. Use french. I used D'arvor The English kaolin use for white
slips!
20 ball clay I used AK
18 talc try C-2 from France or NYtal from the USA
12 alumina and
10 molochite.
I sent this recipe before, when we were wider with quoting recipes from other people
books. Because it is from a published book I call you to buy it!
Val Cushing Handbook it is a treasure for every potter and I use it in the strangest
ocetions as a guide!
Now here is a recipe I converted from G.B. to another way. I don't remember who was
the creator because I do not keep anymore the raku "collections" I have had in the
computer.
The name is the same:
As I wrote before better on a rich with talc -claybody
LUSTEROUSE BLUE REVIZED BY ABABI
Laguna Borate 17.00
Magnesium Carb Light 2.00
FRIT 3134 28.00
EPK Kaolin 3.00
ULTROX 10.00
Copper oxide black 20.00
Cobalt Oxide 20.00
CMC 1.00
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.239 6.90%
CaO 0.627 15.99%
MgO 0.133 2.44%
Al2O3 0.098 4.54%
P2O5 0.000 0.01%
B2O3 0.638 20.17%
SiO2 1.382 37.75%
ZrO2 0.217 12.17%
TiO2 0.001 0.02%
K2O 0.010 0.45%
Na2O 0.229 6.45%
Al:Si 14.10
Expan. 7.84
ST 314.19
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
nice above bellow or without glaze cover with something against the sun: The glaze
has a sensitive skin!
It is a very expensive glaze you keep it in small amounts and use like lustrous!
Keep trying
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.israel-ceramics.org/membersGallery/personalpage.asp?MID=507
Bob Nicholson on sat 24 may 03
>I am going to participate in a raku firing in a few weeks. This will be my
>second time.
>
>1-I'd like to experiment with mid range porcelain clay and / or
>semi-porcelain (1250 C appox, I got some reclaim from my studio colleague).
>Is this a possibility?
Why would you want to use porcelain? At raku firing temperatures,
won't it just look like any other clay?
Ababi on sat 24 may 03
Hello May
Add 30% paper pulp in volume and it will be fine!
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
About paperclay :
http://members4.clubphoto.com/ababi306910/803792/
Similar in Hebrew
http://members4.clubphoto.com/ababi306910/839502/
-
Ababi on sun 25 may 03
I will try to upload some of the Limoges paperclay I made.
I chose to use these fully kaolin claybodies because I looked for the whiteness and the
smoothness. I believe it has started being (lazy) of burnishing. That lazyness brought
me to work harder creating and developing claybodies ( me and V.C.).
Repeating what I have written yesterday: A claybody with 60% plastic clay 18 talc and
22% delicate fillers compare with the best sold here Vingerling (WWB or WBB) K 129
with 50% 0.5 grog - yet wonderful workability, is like driving Porshe - comparing the
best fancier- Jeep! The Vingerling + the Jeep!
Ababi
By the way. V.C. claybody works well at the extruder! or in the extruder. ( Actually
both)
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.israel-ceramics.org/membersGallery/personalpage.asp?MID=507
By the way my page in the last link was updated . More potters joined this site. An
easy way to explore Israeli pottery.
http://www.israel-ceramics.org/
---------- Original Message ----------
>>I am going to participate in a raku firing in a few weeks. This will be my
>>second time.
>>
>>1-I'd like to experiment with mid range porcelain clay and / or
>>semi-porcelain (1250 C appox, I got some reclaim from my studio colleague).
>>Is this a possibility?
>Why would you want to use porcelain? At raku firing temperatures,
>won't it just look like any other clay?
>______________________________________________________________________________
>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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