Randy McCall on sun 8 aug 10
Could someone help reduce the number of chemicals in this glaze recipe. Ap=
=3D
preciate any help.
=3D20
Recipe Name: MCCALLS GREAT GRAY
Cone: 6 Color: GREY/BROWN
Firing: Oxidation Surface: Semi Matt with alot of depth and character=
=3D
.
Amount Ingredient
5 Gerstley Borate--1999
2 Whiting
41 Feldspar--Custer
12 Ball Clay Number 1
10 Red Art
4 Spodumene--Gwalia
9 Dolomite
7 Bone Ash
3 Talc
2 Lithium Carbonate
5 Silica
100 Total
Additives
2 Crocus Martis
1 Manganese Dioxide
1.3 Rutile
4 Iron Oxide--Red
Unity Oxide
.107 Li2O
.068 Na2O
.143 K2O
.217 MgO
.466 CaO
1.000 Total
.397 Al2O3
.053 B2O3
.017 Fe2O3
2.543 SiO2
.009 TiO2
.061 P2O5
6.4 Ratio
71.9 Exp
Randy
=3D
Hank Murrow on sun 8 aug 10
Dear Randy:
Why?? Any recipe with that many ingredients will have a long firing =3D
range due to the multiple melts from all those materials. Could fire =3D
from C8 to C11.=3D20
Cheers, Hank
On Aug 8, 2010, at 2:17 PM, Randy McCall wrote:
> Could someone help reduce the number of chemicals in this glaze =3D
recipe. Appreciate any help.
>=3D20
> Recipe Name: MCCALLS GREAT GRAY
> Cone: 6 Color: GREY/BROWN
> Firing: Oxidation Surface: Semi Matt with alot of depth and =3D
character.
> Amount Ingredient
> 5 Gerstley Borate--1999
> 2 Whiting
> 41 Feldspar--Custer
> 12 Ball Clay Number 1
> 10 Red Art
> 4 Spodumene--Gwalia
> 9 Dolomite
> 7 Bone Ash
> 3 Talc
> 2 Lithium Carbonate
> 5 Silica
> 100 Total
> Additives
> 2 Crocus Martis
> 1 Manganese Dioxide
> 1.3 Rutile
> 4 Iron Oxide--Red
Ron Roy on sun 8 aug 10
Hi Randy,
Send me an analysis for Ball #1 - are you happy with the expansion
where it is?
Need any other fixes? Want 3134 instead of GB?
RR
Quoting Randy McCall :
> Could someone help reduce the number of chemicals in this glaze
> recipe. Appreciate any help.
>
> Recipe Name: MCCALLS GREAT GRAY
> Cone: 6 Color: GREY/BROWN
> Firing: Oxidation Surface: Semi Matt with alot of depth and charact=
er.
> Amount Ingredient
> 5 Gerstley Borate--1999
> 2 Whiting
> 41 Feldspar--Custer
> 12 Ball Clay Number 1
> 10 Red Art
> 4 Spodumene--Gwalia
> 9 Dolomite
> 7 Bone Ash
> 3 Talc
> 2 Lithium Carbonate
> 5 Silica
> 100 Total
> Additives
> 2 Crocus Martis
> 1 Manganese Dioxide
> 1.3 Rutile
> 4 Iron Oxide--Red
> Unity Oxide
> .107 Li2O
> .068 Na2O
> .143 K2O
> .217 MgO
> .466 CaO
> 1.000 Total
> .397 Al2O3
> .053 B2O3
> .017 Fe2O3
> 2.543 SiO2
> .009 TiO2
> .061 P2O5
> 6.4 Ratio
> 71.9 Exp
>
> Randy
>
>
ivor and olive lewis on mon 9 aug 10
Dear Randy McCall,
Am I to believe you created this glaze by "Tweaking" a much simpler recipe
that matured above cone 6 in order to get it to mature at a lower cone valu=
e
and that now there are ingredients that have gone from the market place
(Son's of Gwalia).
My suggestion would be to eliminate talc and whiting and increase the
dolomite, drop out the spodumene and increase the Lithium carbonate then,
leaving out the glass polish, increase RIO to above six but no higher than
9, and finally, forget Redart clay and increase ball clay to compensate. On=
e
percent of Manganese dioxide would seem to be an ineffective proportion in
influencing colour development.
Regards,
Ivor Lewis,
REDHILL,
South Australia
ivor and olive lewis on mon 9 aug 10
Dear Hank Murrow,
Randy McCall told us that the recipe was to be fired at cone 6. Why do you
believe it will not mature before it gets to cone 8 ?
Your concept of multiple melts is an interesting one. It raises the notion
that several fluids will form from which we might conclude that these will
not mix, that there are several immiscible solutions. This becomes apparent
when we realise there are three glass making oxides in the mixture; Boric,
Phosphoric and Silicic.
Perhaps the easiest thing to do is eliminate talc and whiting and increase
the dolomite, drop out the spodumene and increase the Lithium carbonate and
increase RIO above 6, leaving out the glass polish and finally, forget
Redart clay and increase ball clay to compensate.
This should be easy to recalculate.
Regards,
Ivor Lewis,
REDHILL,
South Australia
douglas fur on tue 10 aug 10
Randy
I sympathise with Hank- leave well enough alone. I think you'd loose the
depth and character you mention. If I were to tweek it I'd drop the Lithiu=
m
carb and balance with more Spod. You could also do a series of tests in
each one dropping any one of the materials under 5% to see if it makes a
difference.
DRB
Seola Creek
On Sun, Aug 8, 2010 at 2:17 PM, Randy McCall wrote:
> Could someone help reduce the number of chemicals in this glaze recipe.
> Appreciate any help.
>
> Recipe Name: MCCALLS GREAT GRAY
> Cone: 6 Color: GREY/BROWN
> Firing: Oxidation Surface: Semi Matt with alot of depth and
> character.
> Amount Ingredient
> 5 Gerstley Borate--1999
> 2 Whiting
> 41 Feldspar--Custer
> 12 Ball Clay Number 1
> 10 Red Art
> 4 Spodumene--Gwalia
> 9 Dolomite
> 7 Bone Ash
> 3 Talc
> 2 Lithium Carbonate
> 5 Silica
> 100 Total
> Additives
> 2 Crocus Martis
> 1 Manganese Dioxide
> 1.3 Rutile
> 4 Iron Oxide--Red
> Unity Oxide
> .107 Li2O
> .068 Na2O
> .143 K2O
> .217 MgO
> .466 CaO
> 1.000 Total
> .397 Al2O3
> .053 B2O3
> .017 Fe2O3
> 2.543 SiO2
> .009 TiO2
> .061 P2O5
> 6.4 Ratio
> 71.9 Exp
>
> Randy
>
>
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