Paul Lewing on sun 29 jun 03
I've been trying for years to come up with a glossy dependable cone 5
oxidation iron red. Believe me, I've tried every variation on the Randy's
Red recipe and that's not what I'm looking for.
But I've noticed that the hardest part is keeping the iron from making that
yellowish color it really wants to make in oxidation. I've also noticed
that a bit of tin oxide helps keep it redder, as does a bit of bone ash.
This effect is not as noticeable as it is in reduction, but it's there. But
you can't put in much bone ash, or the color goes greenish and gets opaque
and a little pinholed.
So here's my question. Has any one ever investigated the color differences
produced in this situation using tri-calcium phosphate instead of real bone
ash? I have a lifetime supply of real bone ash, and if I thought it would
make a difference, I'd go get some TCP, but if it won't make any difference,
I'm not going to bother.
Thanks, Paul Lewing, Seattle
Paul Lewing on mon 30 jun 03
on 6/30/03 5:47 AM, Hank Murrow at hmurrow@EFN.ORG wrote:
> Try to find some Ferric Phosphate. We started using it in Shaner- like
> reds in the 60s at the U of Oregon, and it is often helpful in
> developing the red.
Thanks, Hank. Any clues as to what kind of place to look for this stuff?
Is it used for anything in particular? And it sounds like the reds you were
developing were reduction reds. Am I right about that?
Paul Lewing, Seattle
Hank Murrow on mon 30 jun 03
On Sunday, June 29, 2003, at 05:03 PM, Paul Lewing wrote:
> I've been trying for years to come up with a glossy dependable cone 5
> oxidation iron red. Believe me, I've tried every variation on the
> Randy's
> Red recipe and that's not what I'm looking for.
> But I've noticed that the hardest part is keeping the iron from making
> that
> yellowish color it really wants to make in oxidation. I've also
> noticed
> that a bit of tin oxide helps keep it redder, as does a bit of bone
> ash.
> This effect is not as noticeable as it is in reduction, but it's
> there. But
> you can't put in much bone ash, or the color goes greenish and gets
> opaque
> and a little pinholed.
> So here's my question. Has any one ever investigated the color
> differences
> produced in this situation using tri-calcium phosphate instead of real
> bone
> ash? I have a lifetime supply of real bone ash, and if I thought it
> would
> make a difference, I'd go get some TCP, but if it won't make any
> difference,
> I'm not going to bother.
Dear Paul;
Try to find some Ferric Phosphate. We started using it in Shaner- like
reds in the 60s at the U of Oregon, and it is often helpful in
developing the red.
Cheers, Hank in Eugene
dneese on mon 30 jun 03
I have tried both the TCP and the real bone ash in my red iron recipe at
cone 10 reduction. There is a noticeable difference. The glaze is a nice
bright iron red with the true bone ash. Slow cooling helps too.
Dale Tex
"across the alley from the Alamo"
San Antonio, Texas USA
Ababi on mon 30 jun 03
Hello Paul
This recipe I add here is a conversion to "your materials" of a brown red.
Based on a ^5 glaze of Yehuda Koren.
Defiantly not well balanced.
ABABI'S BROWN RED
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Cone 6 1222 deg.C. -
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
silica 36.40
Calcium Carbonate 13.60
EPK 3.90
zinc oxide 9.70
Nepheline Syenite 29.60
strontium carbonate 6.80
Tin Oxide 10.00
Red Iron Oxide 6.00
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.168 4.68%
CaO 0.377 8.46%
MgO 0.002 0.03%
ZnO 0.327 10.65%
SrO 0.126 5.24%
Al2O3 0.225 9.20%
SiO2 2.566 61.73%
K2O 0.040 1.50%
Na2O 0.128 3.19%
Al:Si 11.38
Expan. 7.52
ST 371.57
The next recipe is based on the same source and well balanced. a tile was three
days in vinegar and survived.For brown remove the copper and cobalt and use the
colorants of the first recipe converted to your materials
ABABI'S CAO ZNO BASE
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Cone 6 1222 deg.C. -
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Ferro 3134 17.00
Custer feldspar 41.00
EPK 13.00
Wollastonite 7.00
zinc oxide 7.00
Flint 15.00
Cobalt Oxide 0.75
Copper oxide black 1.00
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.311 7.30%
CaO 0.390 6.64%
MgO 0.009 0.11%
ZnO 0.290 7.17%
Al2O3 0.400 12.36%
B2O3 0.191 4.03%
SiO2 3.423 62.41%
K2O 0.148 4.24%
Na2O 0.163 3.06%
Al:Si 8.56
Expan. 7.39
ST 350.30
(I use synthetic RIO)
BY the way TCP or TSP?
Isn't TCP is the way we connect through our computers?
I hope it helps you
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.matrix2000.co.nz/Matrix%20Demo/Ababi.htm
---------- Original Message ----------
>I've been trying for years to come up with a glossy dependable cone 5
>oxidation iron red. Believe me, I've tried every variation on the Randy's
>Red recipe and that's not what I'm looking for.
>But I've noticed that the hardest part is keeping the iron from making that
>yellowish color it really wants to make in oxidation. I've also noticed
>that a bit of tin oxide helps keep it redder, as does a bit of bone ash.
>This effect is not as noticeable as it is in reduction, but it's there. But
>you can't put in much bone ash, or the color goes greenish and gets opaque
>and a little pinholed.
>So here's my question. Has any one ever investigated the color differences
>produced in this situation using tri-calcium phosphate instead of real bone
>ash? I have a lifetime supply of real bone ash, and if I thought it would
>make a difference, I'd go get some TCP, but if it won't make any difference,
>I'm not going to bother.
>Thanks, Paul Lewing, Seattle
Joe Coniglio on mon 30 jun 03
I had to resort to TCP because I was not able to obtain Bone Ash at the time
because of Mad Cow Disease of all things? Can you believe that? I haven't
looked for any real bone ash since.
Is it being supplied again? Was my suppler pulling my leg?
Jennifer Buckner on mon 30 jun 03
At 05:54 PM 6/30/2003, Joe Coniglio wrote:
>I had to resort to TCP because I was not able to obtain Bone Ash at the time
>because of Mad Cow Disease of all things? Can you believe that? I haven't
>looked for any real bone ash since.
>
>Is it being supplied again? Was my suppler pulling my leg?
Joe,
I just ordered some bone ash today from Bailey Pottery baileypottery.com>
They carry both natural and synthetic bone ash.
Can someone tell me if I can purchase wood ash and if so, where?
Jennifer
Jennifer G. Buckner jenniverre@earthlink.net
Joe Coniglio on tue 1 jul 03
...you know various and sundry wood ash supplies would be beyond cool.
Volcanic ash too for that matter.
Hank Murrow on tue 1 jul 03
> on 6/30/03 5:47 AM, Hank Murrow at hmurrow@EFN.ORG wrote:
>
>> Try to find some Ferric Phosphate. We started using it in Shaner- like
>> reds in the 60s at the U of Oregon, and it is often helpful in
>> developing the red.
On Monday, June 30, 2003, at 09:23 PM, Paul Lewing wrote:
>
> Thanks, Hank. Any clues as to what kind of place to look for this
> stuff?
> Is it used for anything in particular? And it sounds like the reds
> you were
> developing were reduction reds. Am I right about that?
> Paul Lewing, Seattle
Dear Paul;
We got the last 50# bag from a chemical Co. in San Francisco, I forget
the name. i expect it to last as long as I do. The one clue I could
give you is to ask if it is pale yellow color, mine is, and it brushes
pretty smoothly.
originally, we fired reduction C/9, but now, I fire both R and O at
C/10. the reds from Ferric Phosphate can be done in either firing.
Either way, they benefit from a soak in Ox during the cooling.
Cheers, Hank
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