Chris Schafale on fri 26 feb 99
For those who wanted a foodsafe, glossy, cone 6 ox. black, here are a
couple more to try. These are recipes developed by Ron Roy, and
currently being tested for durability, etc. I have tested them
personally, and found both to be very glossy, very black, and not
crazing on several stoneware bodies. Two more versions are also in
the works. Stay tuned.
Chris
Ron Roy Cone 6 Black #1
================
F4 Feldspar......... 21.00 19.09%
WHITING............. 6.00 5.45%
TALC................ 3.00 2.73%
FRIT 3134........... 26.00 23.64%
EPK KAOLIN.......... 17.00 15.45%
SILICA.............. 27.00 24.55%
IRON OXIDE RED...... 9.00 8.18%
*cobalt carbonate.... 1.00 0.91%
========
110.00
CaO 0.61* 8.65%
MgO 0.10* 0.99%
K2O 0.04* 1.03%
Na2O 0.25* 3.99%
TiO2 0.00 0.06%
Al2O3 0.39 10.15%
B2O3 0.33 5.79%
P2O5 0.00 0.04%
SiO2 3.97 60.67%
Fe2O3 0.21 8.64%
Si:Al 10.14
SiB:Al 10.98
Expan 7.22
Ron Roy Cone 6 Black #2
================
G 200 FELDSPAR...... 22.00 20.00%
WHITING............. 4.00 3.64%
TALC................ 5.00 4.55%
FRIT 3134........... 26.00 23.64%
EPK KAOLIN.......... 17.00 15.45%
SILICA.............. 26.00 23.64%
IRON OXIDE RED...... 9.00 8.18%
*cobalt carbonate.... 1.00 0.91%
========
110.00
CaO 0.53* 7.34%
MgO 0.16* 1.63%
K2O 0.10* 2.32%
Na2O 0.21* 3.21%
TiO2 0.00 0.06%
Al2O3 0.40 10.03%
B2O3 0.33 5.74%
P2O5 0.00 0.04%
SiO2 4.10 61.06%
Fe2O3 0.22 8.57%
Si:Al 10.33
SiB:Al 11.16
Expan 7.17
Light One Candle Pottery
Fuquay-Varina, NC
candle@nuteknet.com
Maria Elaine Lanza on sat 21 aug 99
------------------
I am curious to know if the =22two more versions=22 that Chris Schafale =
mentioned in
the Clayart post of February 26, 1999 have been completed.
This month I plan to be testing for suitable black foodsafe glazes for use =
on
Highwater P-5 porcelain and Standard's white stoneware... two =5E4 - =5E6 =
oxidation
clay bodies that I am currently using.
At the moment I do not have one of the ingredients listed in the recipes by =
Ron
Roy... its Frit 3134. I do however have Frit 3124... what do you suspect =
will be
the difference in the final firing if I tried 3124? If, however, you believe
Frit 3134 must be used for optimum glaze performance... I will purchase it.
I appreciate very much your getting back to me and by no means do I take for
granted any help you can provide... I would be willing to report the results=
if
it would be useful to you... I am interested in and have been for some time
getting a satin matte as well as a
glossy foodsafe black for my functional pieces... my intent is to use the =
black
glaze as a liner.
Marie Elaine
----------------------------Original message----------------------------
For those who wanted a foodsafe, glossy, cone 6 ox. black, here are a
couple more to try. These are recipes developed by Ron Roy, and
currently being tested for durability, etc. I have tested them
personally, and found both to be very glossy, very black, and not
crazing on several stoneware bodies. Two more versions are also in
the works. Stay tuned.
Chris
Ron Roy Cone 6 Black =231
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
F4 Feldspar......... 21.00 19.09=25
WHITING............. 6.00 5.45=25
TALC................ 3.00 2.73=25
FRIT 3134........... 26.00 23.64=25
EPK KAOLIN.......... 17.00 15.45=25
SILICA.............. 27.00 24.55=25
IRON OXIDE RED...... 9.00 8.18=25
=2Acobalt carbonate.... 1.00 0.91=25
=3D=3D=3D=3D=3D=3D=3D=3D
110.00
CaO 0.61=2A 8.65=25
MgO 0.10=2A 0.99=25
K2O 0.04=2A 1.03=25
Na2O 0.25=2A 3.99=25
TiO2 0.00 0.06=25
Al2O3 0.39 10.15=25
B2O3 0.33 5.79=25
P2O5 0.00 0.04=25
SiO2 3.97 60.67=25
Fe2O3 0.21 8.64=25
Si:Al 10.14
SiB:Al 10.98
Expan 7.22
Ron Roy Cone 6 Black =232
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
G 200 FELDSPAR...... 22.00 20.00=25
WHITING............. 4.00 3.64=25
TALC................ 5.00 4.55=25
FRIT 3134........... 26.00 23.64=25
EPK KAOLIN.......... 17.00 15.45=25
SILICA.............. 26.00 23.64=25
IRON OXIDE RED...... 9.00 8.18=25
=2Acobalt carbonate.... 1.00 0.91=25
=3D=3D=3D=3D=3D=3D=3D=3D
110.00
CaO 0.53=2A 7.34=25
MgO 0.16=2A 1.63=25
K2O 0.10=2A 2.32=25
Na2O 0.21=2A 3.21=25
TiO2 0.00 0.06=25
Al2O3 0.40 10.03=25
B2O3 0.33 5.74=25
P2O5 0.00 0.04=25
SiO2 4.10 61.06=25
Fe2O3 0.22 8.57=25
Si:Al 10.33
SiB:Al 11.16
Expan 7.17
Light One Candle Pottery
Fuquay-Varina, NC
candle=40nuteknet.com
zahidi neale on sun 22 aug 99
When I used the 3124 instead of 3134 the glaze got bubbly on Standard body
239 (white raku/handbuilding) but was fine on some leftover Texas White
(Laguna??Aardvark?). The 3134 has a beautiful finish on both at ^6 about
3:00 in oxidation electric. The number 2 recipe breaks brown and I still get
a brown side of black regardless of thickness of applied glaze with number
1. I'm gonna try pushing the cobalt up on it. I am using this stuff on
sculpture, so food safe is not a big factor for me. My best test for black
glossy on 239 is:
RR Black #3(sort of)
Custer Spar(!!) 22, whiting 4, talc 5, 3134frit 26, epk 17, flint 26, add
bentonite 2, RIO 9 and cobalt carb 1.2 mixed thin cream consistency and 2
dips. Brushes okay with 2 coats. fired ox to cone 6 at 3:00 over 7 hours.
Breaks brown if thin.
Zahidi on Louisiana Bayou
-----Original Message-----
From: Maria Elaine Lanza
To: CLAYART@LSV.UKY.EDU
Date: Saturday, August 21, 1999 4:27 PM
Subject: Glossy Cone 6 Blacks
----------------------------Original message----------------------------
------------------
I am curious to know if the "two more versions" that Chris Schafale
mentioned in
the Clayart post of February 26, 1999 have been completed.
This month I plan to be testing for suitable black foodsafe glazes for use
on
Highwater P-5 porcelain and Standard's white stoneware... two ^4 - ^6
oxidation
clay bodies that I am currently using.
At the moment I do not have one of the ingredients listed in the recipes by
Ron
Roy... its Frit 3134. I do however have Frit 3124... what do you suspect
will be
the difference in the final firing if I tried 3124? If, however, you believe
Frit 3134 must be used for optimum glaze performance... I will purchase it.
I appreciate very much your getting back to me and by no means do I take for
granted any help you can provide... I would be willing to report the results
if
it would be useful to you... I am interested in and have been for some time
getting a satin matte as well as a
glossy foodsafe black for my functional pieces... my intent is to use the
black
glaze as a liner.
Marie Elaine
----------------------------Original message----------------------------
For those who wanted a foodsafe, glossy, cone 6 ox. black, here are a
couple more to try. These are recipes developed by Ron Roy, and
currently being tested for durability, etc. I have tested them
personally, and found both to be very glossy, very black, and not
crazing on several stoneware bodies. Two more versions are also in
the works. Stay tuned.
Chris
Ron Roy Cone 6 Black #1
================
F4 Feldspar......... 21.00 19.09%
WHITING............. 6.00 5.45%
TALC................ 3.00 2.73%
FRIT 3134........... 26.00 23.64%
EPK KAOLIN.......... 17.00 15.45%
SILICA.............. 27.00 24.55%
IRON OXIDE RED...... 9.00 8.18%
*cobalt carbonate.... 1.00 0.91%
========
110.00
CaO 0.61* 8.65%
MgO 0.10* 0.99%
K2O 0.04* 1.03%
Na2O 0.25* 3.99%
TiO2 0.00 0.06%
Al2O3 0.39 10.15%
B2O3 0.33 5.79%
P2O5 0.00 0.04%
SiO2 3.97 60.67%
Fe2O3 0.21 8.64%
Si:Al 10.14
SiB:Al 10.98
Expan 7.22
Ron Roy Cone 6 Black #2
================
G 200 FELDSPAR...... 22.00 20.00%
WHITING............. 4.00 3.64%
TALC................ 5.00 4.55%
FRIT 3134........... 26.00 23.64%
EPK KAOLIN.......... 17.00 15.45%
SILICA.............. 26.00 23.64%
IRON OXIDE RED...... 9.00 8.18%
*cobalt carbonate.... 1.00 0.91%
========
110.00
CaO 0.53* 7.34%
MgO 0.16* 1.63%
K2O 0.10* 2.32%
Na2O 0.21* 3.21%
TiO2 0.00 0.06%
Al2O3 0.40 10.03%
B2O3 0.33 5.74%
P2O5 0.00 0.04%
SiO2 4.10 61.06%
Fe2O3 0.22 8.57%
Si:Al 10.33
SiB:Al 11.16
Expan 7.17
Light One Candle Pottery
Fuquay-Varina, NC
candle@nuteknet.com
Ron Roy on mon 23 aug 99
Hi Marie,
I have recalculated the black glaze with Frit 3124 but - as you can see it
does not make much sense - first of all you have to use a lot more 3124
because there is not as much boron in it compared to 3134. The other
problem - because there is some alumina in 3124 you can't have as much raw
clay in the recipe and this will probably lead to the glaze settling in the
bucket much faster. I think you should get the 3134 - it is my Frit of
choice for cone 6 glazes - usually.
Because of all the Frit this glaze will melt more - so test it first it may
need to be adjusted.
RR black with frit 3124.
-----------------
CUSTER SPAR......... 20.00
WHITING............. 2.50
TALC................ 5.00
F3124............... 44.00
EPK................. 7.00
SILICA.............. 21.50
BENTONITE........... 2.00
RED IRON OX......... 9.00
cobalt carb......... 1.00
----------
112.00
RATIO 10.45 (original is 10.42)
EXPAN 442.94 (original is 446.39)
RR
>This month I plan to be testing for suitable black foodsafe glazes for use on
>Highwater P-5 porcelain and Standard's white stoneware... two ^4 - ^6 oxidation
>clay bodies that I am currently using.
>
>At the moment I do not have one of the ingredients listed in the recipes by Ron
>Roy... its Frit 3134. I do however have Frit 3124... what do you suspect
>will be
>the difference in the final firing if I tried 3124? If, however, you believe
>Frit 3134 must be used for optimum glaze performance... I will purchase it.
>
>I appreciate very much your getting back to me and by no means do I take for
>granted any help you can provide... I would be willing to report the results if
>it would be useful to you... I am interested in and have been for some time
>getting a satin matte as well as a
>glossy foodsafe black for my functional pieces... my intent is to use the black
>glaze as a liner.
>
>Marie Elaine
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
Chris Schafale on tue 24 aug 99
Here are the other two versions I mentioned. I tested them, but
didn't see any improvement over the first two, so I've been using #1.
Others may want to test for themselves. The reason for the use of
OM4 was that I was/am having trouble with crawling in glazes that use
a lot of EPK.
Chris
>> F-1 --RR,s Black cone 6 foodsafe? with some ball for EPK
>> -----------------
>> G 200 SPAR.............20.00
>> WHITING...................4.00
>> TALC...........................5.00
>> F3134.......................26.00
>> EPK...........................10.00
>> OM-4.......................10.00
>> SILICA......................25.00
>> BENTONITE..............2.00
>> RED IRON OX..........9.00
>> cobalt carb......... 1.00
>> ----------
>> Total......................112.00
>>
>> FORMULA & ANALYSIS
>> ------------------
>> *CaO........ .55 7.61%
>> MnO2....... .00 .01%
>> *MgO........ .15 1.52%
>> *K2O........ .09 2.16%
>> *Na2O....... .21 3.20%
>> Fe2O3...... .22 8.78%
>> TIO2....... .01 .14%
>> B2O3....... .33 5.67%
>> AL2O3...... .40 10.08%
>> SiO2....... 4.09 60.82%
>> P2O5....... .00 .01%
>>
>> RATIO 10.26
EXPAN 448.58
WEIGHT 403.27 >>
>> F2 RR's c6 foodsafe? black - no EPK
>>
>> -----------------
>> G 200 SPAR............20.00
>> WHITING..................4.00
>> TALC..........................6.00
>> F3134......................24.00
>> OM-4......................24.00
>> SILICA.....................22.00
>> BENTONITE.............2.00
>> RED IRON OX.........9.00
>> cobalt carb...............1.00
>> ----------
>> Total.....................112.00
>>
>>
>> FORMULA & ANALYSIS
>> ------------------
>> *CaO........ .52 7.37%
>> MnO2....... .00 .01%
>> *MgO........ .18 1.85%
>> *K2O........ .10 2.26%
>> *Na2O....... .20 3.05%
>> Fe2O3...... .22 8.89%
>> TIO2....... .01 .27%
>> B2O3....... .30 5.25%
>> AL2O3...... .40 10.26%
>> SiO2....... 4.04 60.79%
>> P2O5.......
>>
>> RATIO 10.07
>> EXPAN 449.38 WEIGHT 399.20
> ----------------------------Original message----------------------------
> ------------------
>
> I am curious to know if the "two more versions" that Chris Schafale mentioned
> the Clayart post of February 26, 1999 have been completed.
>
> This month I plan to be testing for suitable black foodsafe glazes for use on
> Highwater P-5 porcelain and Standard's white stoneware... two ^4 - ^6 oxidatio
> clay bodies that I am currently using.
>
> At the moment I do not have one of the ingredients listed in the recipes by Ro
> Roy... its Frit 3134. I do however have Frit 3124... what do you suspect will
> the difference in the final firing if I tried 3124? If, however, you believe
> Frit 3134 must be used for optimum glaze performance... I will purchase it.
>
> I appreciate very much your getting back to me and by no means do I take for
> granted any help you can provide... I would be willing to report the results i
> it would be useful to you... I am interested in and have been for some time
> getting a satin matte as well as a
> glossy foodsafe black for my functional pieces... my intent is to use the blac
> glaze as a liner.
>
> Marie Elaine
>
>
> ----------------------------Original message----------------------------
> For those who wanted a foodsafe, glossy, cone 6 ox. black, here are a
> couple more to try. These are recipes developed by Ron Roy, and
> currently being tested for durability, etc. I have tested them
> personally, and found both to be very glossy, very black, and not
> crazing on several stoneware bodies. Two more versions are also in
> the works. Stay tuned.
>
> Chris
>
>
> Ron Roy Cone 6 Black #1
> ================
> F4 Feldspar......... 21.00 19.09%
> WHITING............. 6.00 5.45%
> TALC................ 3.00 2.73%
> FRIT 3134........... 26.00 23.64%
> EPK KAOLIN.......... 17.00 15.45%
> SILICA.............. 27.00 24.55%
> IRON OXIDE RED...... 9.00 8.18%
> *cobalt carbonate.... 1.00 0.91%
> ========
> 110.00
>
> CaO 0.61* 8.65%
> MgO 0.10* 0.99%
> K2O 0.04* 1.03%
> Na2O 0.25* 3.99%
> TiO2 0.00 0.06%
> Al2O3 0.39 10.15%
> B2O3 0.33 5.79%
> P2O5 0.00 0.04%
> SiO2 3.97 60.67%
> Fe2O3 0.21 8.64%
>
> Si:Al 10.14
> SiB:Al 10.98
> Expan 7.22
>
>
> Ron Roy Cone 6 Black #2
> ================
> G 200 FELDSPAR...... 22.00 20.00%
> WHITING............. 4.00 3.64%
> TALC................ 5.00 4.55%
> FRIT 3134........... 26.00 23.64%
> EPK KAOLIN.......... 17.00 15.45%
> SILICA.............. 26.00 23.64%
> IRON OXIDE RED...... 9.00 8.18%
> *cobalt carbonate.... 1.00 0.91%
> ========
> 110.00
>
> CaO 0.53* 7.34%
> MgO 0.16* 1.63%
> K2O 0.10* 2.32%
> Na2O 0.21* 3.21%
> TiO2 0.00 0.06%
> Al2O3 0.40 10.03%
> B2O3 0.33 5.74%
> P2O5 0.00 0.04%
> SiO2 4.10 61.06%
> Fe2O3 0.22 8.57%
>
> Si:Al 10.33
> SiB:Al 11.16
> Expan 7.17
>
>
>
>
> Light One Candle Pottery
> Fuquay-Varina, NC
> candle@nuteknet.com
>
>
Light One Candle Pottery
Fuquay-Varina, NC
candle@intrex.net
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