John Sankey on fri 23 may 08
The only satisfactory bright clear yellows I have found for cone 6 ox have
been with stains.
And by the way, I've found the colour of the stain in the package to be
closer to the final
result than most published colour swatches. Make sure you test the specific
stain with your
base - some yellows bleach with some bases. I'm using Mason 'Zircon Yellow'
with
VC Gloss Base to make spectacular banana slugs for indoor gardeners.
John Sankey
See the Glaze Database
http://sankey.ws/glazedata.html
-------------
Include 'Byrd' in the subject line of your reply to get through my spam
filter.
I can only read text mail, no attachments.
=?iso-8859-1?Q?Tig_Dupr=E9?= on fri 23 may 08
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I have been asked by a friend to find a sunflower/golden=20
yellow glaze. It can be either cone 6 or 10reduction. I=20
have Mel's Fat Whit with titanium and rutile under test=20
now, but if there are other ideas I would love to see=20
them. Thanks All! Loren Jones
--------------------------<>----------------------=0A=
Loren,
I have a wonderful sunshine yellow which uses praesodymium
oxide for the color. It also makes a great Faux Celadon if
you use a smidge of copper carbonate and a dash of black stain
for the colorants.
The yellow may be a bit too intense, in which case you can=20
cut the color with a tad of iron, say about 1-2%.
The usual cautions, your mileage may vary, TEST, TEST, TEST!
Warm regards,
Tig Dupre
in Port Orchard, Washington
Here's the recipe:
++++++++++++++++++++++++++++++++++++++++++++
+++ Cone Six - 132 Celadon--Yellow +++
++++++++++++++++++++++++++++++++++++++++++++
Range: 5-7
Firing type: Oxidation
Glaze type: Celadon
Color: Yellow
Surface: Semi-gloss
Transparency: Translucent
Source: Dupre
Date: 01/30/2002
Wollastonite 20.00 20.00%
Calcined china clay 10.00 10.00%
Silica 10.00 10.00%
Gillespie borate 10.00 10.00%
Kona F-4 feldspar 50.00 50.00%
-------- -------
100.00 100.00%
Praseodymium oxide 6.00 6.00%
Bentonite 2.00 2.00%
-----------------------------------------------
[NOTE:] original colorants for celadon:
Copper carbonate 0.30
Black Stain 0.10
Notes:
My experiment with an oxidizing celadon. Check for differences between Ch=
ina Clay
and Calcined China Clay. Also check on Black Stain. Do with several dif=
ferent
substitutes for Gerstley Borate. Try substituting Frit 3134 for Gillespi=
e borate.
26 May 03: Test tile is delightful! A magnificent celadon-like dolphin g=
ray-green,
breaking well over texture and pooling in depressions. Glossy, deep, and=
rich.
Might even use less copper, and a little less stain.
10 APR 05: I changed the colorants. Added praseodymium stain and took ou=
t the
copper and black stain. I may add iron later, after some tests. Also, =
need to
add a tablespoon or two of epsom salts solution to assist suspension. NO=
TE: Try
substituting part of the Kona F4 with Cornwall stone, say 25 F4 and 25 Co=
rnwall.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D
Chemical Analysis
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D
Na2O 0.190 Al2O3 0.443 SiO2 3.105
K2O 0.077 B2O3 0.107 TiO2 0.000
MgO 0.035 Fe2O3 0.002
CaO 0.696 PrO2 0.110
SrO 0.001
Alumina:Silica ratio is 1.00 : 7.00
Neutral:Acid ratio is 1.00 : 5.85
Alkali:Neutral:Acid ratio is 1.00 : 0.55 : 3.22
Weight percentages:
Na2O 3.70% Al2O3 14.21% SiO2 58.63%
K2O 2.29% B2O3 2.33% TiO2 0.00%
MgO 0.44% Fe2O3 0.10%
CaO 12.27% PrO2 5.99%
SrO 0.04%
Volatiles:
Other 2.76%
Loss On Ignition: 2.68%
Molecular percentages:
Na2O 3.99% Al2O3 9.30% SiO2 65.14%
K2O 1.62% B2O3 2.23% TiO2 0.00%
MgO 0.74% Fe2O3 0.04%
CaO 14.60% PrO2 2.31%
SrO 0.03%
Expansion coefficient: 75.2 x 10e-7 per degree C
(estimate based on oxides composing 94% of fired weight)
Oxides causing abnormal expansion effects: B2O3 SrO
Viscosity index: 37.8
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-----------=
---------------<<snip>>----------------------
I have been as=
ked by a friend to find a sunflower/golden
yellow glaze. It can be eith=
er cone 6 or 10reduction. I
have Mel's Fat Whit with titanium and rutil=
e under test
now, but if there are other ideas I would love to see
=
them. Thanks All! Loren Jones
--------------------------<<snip>=
>----------------------=0A=
Loren,
I have a wonderful sunshine yellow which uses praesodymiu=
m
oxide for the color. It also makes a great Faux Celadon if
you use=
a smidge of copper carbonate and a dash of black stain
for the colorant=
s.
The yellow may be a bit too intense, in which case you can
cu=
t the color with a tad of iron, say about 1-2%.
The usual cautions, =
your mileage may vary, TEST, TEST, TEST!
Warm regards,
Tig Du=
pre
in Port Orchard, Washington
Here's the recipe:
+++++++=
+++++++++++++++++++++++++++++++++++++
+++ Cone Six - 132 Celadon--Ye=
llow +++
++++++++++++++++++++++++++++++++++++++++++++
Range: =
5-7
Firing type: Oxidation
Glaze type: Celadon
Color=
: Yellow
Surface: Semi-gloss
Transparency: Transluc=
ent
Source: Dupre
Date: 01/30/2002
=
Wollastonite 20.00 20.00%
Calcined china clay 10.00 =
10.00%
Silica 10.00 10.00%
Gillespie bo=
rate 10.00 10.00%
Kona F-4 feldspar 50.00 50.00%> -------- -------
1=
00.00 100.00%
Praseodymium oxide 6.00 6.00%
=
Bentonite 2.00 2.00%
----------------------------=
-------------------
[NOTE:] original colorants for celadon:
C=
opper carbonate 0.30
Black Stain 0.10
Notes:
=
My experiment with an oxidizing celadon. Check for differences between Chi=
na Clay
and Calcined China Clay. Also check on Black Stain. Do with =
several different
substitutes for Gerstley Borate. Try substituting F=
rit 3134 for Gillespie borate.
26 May 03: Test tile is delightful!=
A magnificent celadon-like dolphin gray-green,
breaking well over te=
xture and pooling in depressions. Glossy, deep, and rich.
Might even =
use less copper, and a little less stain.
10 APR 05: I changed the=
colorants. Added praseodymium stain and took out the
copper and blac=
k stain. I may add iron later, after some tests. Also, need to
add =
a tablespoon or two of epsom salts solution to assist suspension. NOTE: Tr=
y
substituting part of the Kona F4 with Cornwall stone, say 25 F4 and =
25 Cornwall.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Chemical Analysis
=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=
Na2O 0.190 Al2O3 0.443 SiO2 3.105
K2O 0.077 B2O3 =
0.107 TiO2 0.000
MgO 0.035 Fe2O3 0.002r> CaO 0.696 PrO2 0.110
SrO 0.001
> Alumina:Silica ratio is 1.00 : 7.00
Neutral:Acid ratio is 1=
.00 : 5.85
Alkali:Neutral:Acid ratio is 1.00 : 0.55 : 3.22
We=
ight percentages:
Na2O 3.70% Al2O3 14.21% SiO2 58.63%
=
K2O 2.29% B2O3 2.33% TiO2 0.00%
MgO 0.44% =
Fe2O3 0.10%
CaO 12.27% PrO2 5.99%
=
SrO 0.04%
Volatiles:
Other 2.76%
Loss On I=
gnition: 2.68%
Molecular percentages:
Na2O 3.99% Al2O3 =
9.30% SiO2 65.14%
K2O 1.62% B2O3 2.23% TiO2 0.00%> MgO 0.74% Fe2O3 0.04%
CaO 14.60% =
PrO2 2.31%
SrO 0.03%
Expansion coefficient: 7=
5.2 x 10e-7 per degree C
(estimate based on oxides composing 94% of fi=
red weight)
Oxides causing abnormal expansion effects: B2O3 SrO
=
Viscosity index: 37.8
=
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Lynn Goodman Porcelain Pottery on mon 26 may 08
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format=flowed
It took me a couple of days to look at the composition of this stain
because, apparently, Mason is discontinuing this stain! It is no
longer on the web site, so I needed to check my materials at the
studio. (They supply a handy chart with directions on how to
reproduce this and the bunches of other discontinued stains-- all
using other discontinued stains. Sigh.) I guess I'll be buying a lot
of 6407, right away, in preparation for the drought to come. Anyone
on clayart who uses Mason stains should check to see if their stains
will still be available.
Anyway, 6407 is made from praesodymium, iron and zirconium (so, not
toxic) and will fire to 2300F.
Lynn
On May 24, 2008, at 1:53 PM, Ron Roy wrote:
> Best to know what is in the stain (companies will list
> ingrediants) to see
> if there are toxicity issues. Vanadium is toxic for instance.
> Then you can decide if you need a stable glaze if used as a liner
> or to
> keep it outside the pot.
>
> RR
Lynn Goodman
Fine Porcelain Pottery
Cell 347-526-9805
www.lynngoodmanporcelain.com
--Apple-Mail-1--556255281
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
charset=ISO-8859-1
-webkit-line-break: after-white-space; ">
It took me a couple of days to look at the composition of this stain =
because, apparently, Mason is discontinuing this stain! It is no longer =
on the web site, so I needed to check my materials at the studio. (They =
supply a handy chart with directions on how to reproduce this and the =
bunches of other discontinued stains-- all using other discontinued =
stains. Sigh.) I guess I'll be buying a lot of 6407, right away, in =
preparation for the drought to come. Anyone on clayart who uses Mason =
stains should check to see if their stains will still be =
available.
Anyway, =
6407 is made from praesodymium, iron and zirconium (so, not toxic) and =
will fire to 2300F.=A0
class=3D"webkit-block-placeholder">
Lynn >On May 24, 2008, at 1:53 PM, Ron Roy wrote: class=3D"Apple-interchange-newline"> style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">Best to know what is in the stainclass=3D"Apple-converted-space">=A0 (companies will list =
ingrediants) to see 0px; margin-bottom: 0px; margin-left: 0px; ">if there are toxicity =
issues. Vanadium is toxic for instance. 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; =
min-height: 14px; ">style=3D"-webkit-text-stroke-width: -1; ">Then you can decide if you =
need a stable glaze if used as a liner or to style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">keep it outside the pot. style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; min-height: 14px; ">
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; =
">RR
0.0px 0.0px 0.0px 0.0px">style=3D"font: 12.0px Helvetica">Lynn Goodman style=3D"margin: 0.0px 0.0px 0.0px 0.0px">size=3D"3" style=3D"font: 12.0px Helvetica">Fine Porcelain =
Pottery face=3D"Helvetica" size=3D"3" style=3D"font: 12.0px Helvetica">Cell =
347-526-9805 0.0px">Helvetica">www.lynngoodmanporcelain.com =
=
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