gary navarre on wed 7 mar 12
Ya, I'd agree. Even though I layer glazes and mix ashes or oxides in some I=
=3D
don't think Leach Clear ran much except maybe a bit when close up front at=
=3D
past ^13 on the ash side but the rest of the pieces were pretty nice. I'd =
=3D
need to look at my video notes to see where I used it but I had some sample=
=3D
s on pots spread around the wood kiln. Actually the worst sticking to shelv=
=3D
es I had was from Porcelain plucking. If I recall the Leach Clear seemed a =
=3D
bit powdery when dry so handle carefully.=3D0A=3D0A=3DA0=3D0AGary Navarre=
=3D0ANavarre=3D
Pottery=3D0ANavarre Enterprises=3D0ANorway, Michigan, USA=3D0Ahttp://www.N=
avarre=3D
Pottery.etsy.com=3DA0=3DA0=3DA0=3DA0=3DA0 <...... New Pots=3D0Ahttp://www.y=
outube.com/G=3D
indaUP=3D0Ahttp://public.fotki.com/GindaUP/=3D0A=3D0A=3D0A=3D0A____________=
__________=3D
__________=3D0A From: Paul Herman =3D0ATo: Clay=
art@=3D
LSV.CERAMICS.ORG =3D0ASent: Wednesday, March 7, 2012 7:35 PM=3D0ASubject: R=
e: [=3D
Clayart] Leach 4321 glaze=3D0A =3D0AGene,=3D0A=3D0AI have used this base gl=
aze for =3D
my celadon for many years. It is one=3D0Aof my most dependable glazes. I in=
cr=3D
eased the silica to 36 and the epk=3D0Ato 16 in order to get it to stop cra=
zi=3D
ng. It does not run or crawl,=3D0Aand has a nice opacity due to many tiny b=
ub=3D
bles, from the whiting I=3D0Aguess. One percent red iron makes it a celadon=
. =3D
It behaves really well=3D0Ain the wood firings, never running even at cone =
12=3D
-13.=3D0A=3D0AGood luck,=3D0A=3D0APaul Herman=3D0A=3D0AGreat Basin Pottery=
=3D0ADoyle, Cal=3D
ifornia US=3D0Awww.greatbasinpottery.com/=3D0A=3D0A=3D0A=3D0A=3D0AOn Mar 7,=
2012, at 3:=3D
32 PM, mudduckroadrunner wrote:=3D0A=3D0A> Is there anyone using Leach's 43=
21 c=3D
one 10 base glaze??=3D0A>=3D0A> I plan to do some experimenting with some d=
iffe=3D
rent oxides and this=3D0A> looked like an all around good recipe to use.=3D=
0A>=3D
=3D0A> Does it crawl or run??=3D0A>=3D0A> Are there other good reliable con=
e 10 b=3D
ase glazes to play with???=3D0A>=3D0A> Leach clear base=3D0A>=3D0A> custer=
=3DA0 =3DA0 =3D
=3DA0 =3DA0 40=3D0A> silica=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 30=3D0A> whiting=
=3DA0 =3DA0 =3DA0 =3DA0 2=3D
0=3D0A> epk=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 10=3D0A>=3D0A> Thanks!=
!!!=3D0A> Gene=3D0A> mud=3D
duck@mudduckpottery.net=3D0A> www.mudduckpottery.net
mudduckroadrunner on wed 7 mar 12
Is there anyone using Leach's 4321 cone 10 base glaze??=3D20
I plan to do some experimenting with some different oxides and this =3D
looked like an all around good recipe to use.=3D20
Does it crawl or run??=3D20
Are there other good reliable cone 10 base glazes to play with???
Leach clear base
custer 40
silica 30
whiting 20
epk 10
Thanks!!!!
Gene
mudduck@mudduckpottery.net
www.mudduckpottery.net
Paul Herman on wed 7 mar 12
Gene,
I have used this base glaze for my celadon for many years. It is one
of my most dependable glazes. I increased the silica to 36 and the epk
to 16 in order to get it to stop crazing. It does not run or crawl,
and has a nice opacity due to many tiny bubbles, from the whiting I
guess. One percent red iron makes it a celadon. It behaves really well
in the wood firings, never running even at cone 12-13.
Good luck,
Paul Herman
Great Basin Pottery
Doyle, California US
www.greatbasinpottery.com/
On Mar 7, 2012, at 3:32 PM, mudduckroadrunner wrote:
> Is there anyone using Leach's 4321 cone 10 base glaze??
>
> I plan to do some experimenting with some different oxides and this
> looked like an all around good recipe to use.
>
> Does it crawl or run??
>
> Are there other good reliable cone 10 base glazes to play with???
>
> Leach clear base
>
> custer 40
> silica 30
> whiting 20
> epk 10
>
> Thanks!!!!
> Gene
> mudduck@mudduckpottery.net
> www.mudduckpottery.net
Gwynneth Rixon on thu 8 mar 12
I use that base for half of my glazes, firing cone 9 to 10 with propane
gas, mainly oxidised.
I'm still playing with different additions after nearly forty years!
Gwynneth
Wales
www.gwynnethrixonceramics.co.uk
On Wed, Mar 7, 2012 at 11:32 PM, mudduckroadrunner wr=
ote:
> Is there anyone using Leach's 4321 cone 10 base glaze??
>
> I plan to do some experimenting with some different oxides and this looke=
d
> like an all around good recipe to use.
>
> Does it crawl or run??
>
> Are there other good reliable cone 10 base glazes to play with???
>
> Leach clear base
>
> custer 40
> silica 30
> whiting 20
> epk 10
>
> Thanks!!!!
> Gene
> mudduck@mudduckpottery.net
> www.mudduckpottery.net
>
Des & Jan Howard on thu 8 mar 12
Gene
While I wouldn't call Leach 4321 actually bombproof, it
comes close.
Fire 9-10 hours, frosty at Cone 9, glassy at Cone 11.
Fast reduction gas firing, say 4-6 hours, greenish
glassy at Cone 9, grey stoneware body.
Slowww wood firing, say 18-24 hours, white frosty at
Cone 11, toasty med. brown, same body as above.
I wouldn't bother being so specific as to materials.
Any Potash feldspar
Silica
Any kaolin
Could crawl, not likely with standard recipe. Could
run, depends on applied thickness, pot shape, amount of
added oxides.
Want satin? Replace SOME of the limestone/whiting 1:1
with dolomite.
Want to drop firing temp? Replace SOME of the pot
feldspar with soda feldspar 1:1.
For a satin kaki, replace kaolin 1:1 with any red clay.
Cobalt & iron deco work well under base glaze.
Des
On 8/03/2012 10:32 AM, mudduckroadrunner wrote:
> Is there anyone using Leach's 4321 cone 10 base glaze??
> I plan to do some experimenting with some different oxides
> and this looked like an all around good recipe to use.
> Does it crawl or run??
> Leach clear base
> custer 40
> silica 30
> whiting 20
> epk 10
--
Des & Jan Howard
Lue Pottery
Lue NSW
Australia
2850
02 6373 6419
www.luepottery.hwy.com.au
-32.656072 149.840624
ronroy@CA.INTER.NET on thu 8 mar 12
Hi Gene,
Here it is with g200 HP as the spar. Looks like a stable glaze but
high calcium so the slower its cooled then less shiny it will be. It's
going to craze. I used the ball clay to stop the powdering that comes
with kaolin.
G 200 HP.................... 35.00
SILICA...................... 27.00
WHITING..................... 26.00
OM-4........................ 12.00
=3D=3D=3D=3D=3D=3D=3D=3D=3D
100.00
CaO 0.81*
MgO 0.01*
K2O 0.16*
Na2O 0.03*
Fe2O3 0.00
TiO2 0.01
Al2O3 0.30
SiO2 2.93
Si:Al: 9.87
SiB:Al: 9.87
Thermal Expansion: 568.00
Formula Weight: 269.11
Here is a revision based on that glaze - it probably wont craze and is
a more balanced glaze - more stable and should be fault free.
G 200 HP.................... 23.00
TALC AMTAL C-98 or 2882(Texa 5.00 < Pioneer talc.
SILICA...................... 32.00
WHITING..................... 17.00
OM-4........................ 23.00
=3D=3D=3D=3D=3D=3D=3D=3D=3D
100.00
CaO 0.68*
MgO 0.16*
K2O 0.14*
Na2O 0.03*
Fe2O3 0.01
TiO2 0.01
Al2O3 0.41
SiO2 4.07
Si:Al: 9.96
SiB:Al: 9.96
Thermal Expansion: 410.50
Formula Weight: 347.64
RR
Quoting mudduckroadrunner :
> Is there anyone using Leach's 4321 cone 10 base glaze??
>
> I plan to do some experimenting with some different oxides and this
> looked like an all around good recipe to use.
>
> Does it crawl or run??
>
> Are there other good reliable cone 10 base glazes to play with???
>
> Leach clear base
>
> custer 40
> silica 30
> whiting 20
> epk 10
>
> Thanks!!!!
> Gene
> mudduck@mudduckpottery.net
> www.mudduckpottery.net
>
ivor and olive lewis on fri 9 mar 12
Dear Gene,
Please note that the Leach 4-3-2-1 is Seger Cone 8. It is a glaze I would
have tried out four decades or so ago so my memories of it are
spectacularly vague. But I do recall forming an opinion that this glaze
would be improved by increasing the felspar content to ensure a fully matur=
e
fusion at Orton Cone eight.
I agree with Des Howard's ideas. I have a test series ( A permutation of
four ingredients giving 108 samples covering 3: 6*6 tiles) where the Soda
Felspar values run from 71.43% to 53.57%, Kaolin, Talc and Wollastonite are
graded from 21.42% to 3.57% ) Fired to Orton Cone 8, samples vary from
mirror reflective transparent through to opaque satin mat.and flow characte=
r
from fluid to viscous.
Hope you have success with your choice.
Regards,
Ivor Lewis,
REDHILL,
South Australia
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