Bill Merrill on tue 27 apr 10
Mels methods that he just wrote about work for him. Like ancient
potters many of them knew how a glaze worked because they knew their
materials and what the materials would do by themselves and when mixed
together. The measuring would usually be measured with the volume of
the material. =3D20
=3D20
An interesting way to do this is to use a system named "1-2 -3 " glazes.
This is usually done with cone 10 glazes. The 3 is usually a Feldspar.
It is advisable to let the 3 parts be feldspar. The 1 and 2 are
materials common to high fire. Dolomite, Whiting, Kaolin, Barium,
flint, talc, strontium, Colemanite, zinc, wood ash, etc.
=3D20
It is a great starting point for your glaze knowledge....This system
will give different types of glazes and surfaces. A simple glaze would
be . . 3 Feldspar ( soda, potassium or lithium feldspar) 2 flint and
1 whiting. I get a beautiful iron crystal glaze from this when iron
or ochre is added. =3D20
=3D20
Try this system, it will give an interesting starting point for seeing
how things melt and the surface they produce. Once fired other
variations may be added or some material may be lessened. Remember the
base glaze makes it possible for certain colors. A copper red will not
be arrived at with a high MG0 glaze, it will tend to go pink or liver
color. This is a great starting point for developing a glaze. Let it
be a study, fire the tiles and see what they produce.
=3D20
I put iron, cobalt and rutile on a test tile while leaving one side
plain. White slp is another thing to be tested under your glaze. There
is no such thing as fast food glaze knowledge. This is a quest for a
glaze that only you can dream of.=3D20
=3D20
Other glaze temperature glazes may be developed using lower fire fluxes
etc.
=3D20
Bill
douglas fur on tue 27 apr 10
FYI
I think this idea comes from Hamada via "A Potter's Book"
On Tue, Apr 27, 2010 at 11:18 AM, Bill Merrill wrote:
An interesting way to do this is to use a system named "1-2 -3 " glazes.
This is usually done with cone 10 glazes. The 3 is usually a Feldspar.
It is advisable to let the 3 parts be feldspar. The 1 and 2 are
materials common to high fire. Dolomite, Whiting, Kaolin, Barium,
flint, talc, strontium, Colemanite, zinc, wood ash, etc.
DRB
Burien
Eric Hansen on tue 27 apr 10
>
> That would be what I call the "Hamada Base" discussed on Leach a Potters
> Book on page 165. I find it hard to believe that Hamada did not use his
> extensive training in the ceramics sciences and industry at Kyoto in
> developing the series of glazes he designed using this base. So Leach and
> Hamada had this road show going - while Leach would expostulate on Yanagi=
=3D
's
> theories, there would be Hamada, the "Unknown Craftsman", wordlessly goin=
=3D
g
> about the demo. You can watch on Youtube, it is quite theatrical. But whe=
=3D
n
> it came down to nuts and bolts he worked out the empirical equations just
> like you or I do, except now we use computers. I imagine later, for
> production reasons, he might have measured by volume; certainly in the sh=
=3D
op
> we might want to use this conversion. There are exceptions to the rule, b=
=3D
ut
> the good old Seger formula still works pretty good for the types of glaze=
=3D
s
> we=3D92re discussing.
>
> h a n s e n
>
>
>
> =3D93Hamada Base=3D94- Leach pg. 165
>
> 1 limestone
>
> 2 quartz
>
> 3 feldspar
>
Edouard Bastarache on tue 27 apr 10
Eric
From GlazeChem
-Whiting 16.7%
-Silica 33.3%
-Custer feldspar 50.0%
--------
100.0%
Na2O 0.09 Al2O3 0.34 SiO2 4.57
K2O 0.22 Fe2O3 0.00
CaO 0.68
Alumina:Silica ratio is 1.00:13.27
Neutral:Acid ratio is 1.00:13.27
Alk:Neut:Acid ratio is 1.00:0.34:4.57
Expansion: 71.3 x 10e-7 per degree C
Gis,
Edouard Bastarache
Spertesperantisto
Sorel-Tracy
Quebec
http://www.flickr.com/photos/30058682@N00/
http://edouardbastarache.blogspot.com/
http://blogsalbertbastarache.blogspot.com/
http://cerampeintures.blogspot.com/
http://perso.wanadoo.fr/smart2000/index.htm
----- Original Message -----
From: "Eric Hansen"
To: "douglas fur" <23drb50@gmail.com>
Cc:
Sent: Tuesday, April 27, 2010 4:44 PM
Subject: Re: [Clayart] 1,2,3 glazes
>
> That would be what I call the "Hamada Base" discussed on Leach a Potters
> Book on page 165. I find it hard to believe that Hamada did not use his
> extensive training in the ceramics sciences and industry at Kyoto in
> developing the series of glazes he designed using this base. So Leach and
> Hamada had this road show going - while Leach would expostulate on
> Yanagi's
> theories, there would be Hamada, the "Unknown Craftsman", wordlessly goin=
g
> about the demo. You can watch on Youtube, it is quite theatrical. But whe=
n
> it came down to nuts and bolts he worked out the empirical equations just
> like you or I do, except now we use computers. I imagine later, for
> production reasons, he might have measured by volume; certainly in the
> shop
> we might want to use this conversion. There are exceptions to the rule,
> but
> the good old Seger formula still works pretty good for the types of glaze=
s
> we're discussing.
>
> h a n s e n
>
>
>
> "Hamada Base"- Leach pg. 165
>
> 1 limestone
>
> 2 quartz
>
> 3 feldspar
>
Lee Love on tue 27 apr 10
My base ash glaze in Mashiko was:
3 woodash
2 ball clay
1 amakusa (porcelain stone)
--
Lee, a Mashiko potter in Minneapolis
http://mashikopots.blogspot.com/
=3D93Observe the wonders as they occur around you. Don't claim them. Feel t=
he
artistry moving through and be silent.=3D94 --Rumi
Eric Hansen on tue 27 apr 10
nice! by weight? or by scoop?
h a n s e n
On Tue, Apr 27, 2010 at 6:51 PM, Lee Love wrote:
> My base ash glaze in Mashiko was:
>
> 3 woodash
> 2 ball clay
> 1 amakusa (porcelain stone)
>
> --
> Lee, a Mashiko potter in Minneapolis
> http://mashikopots.blogspot.com/
>
> =3D93Observe the wonders as they occur around you. Don't claim them. Feel=
t=3D
he
> artistry moving through and be silent.=3D94 --Rumi
>
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