Helllll@AOL.COM on mon 13 nov 00
Hello...
I have had this happen in the past ... with more then one cone 10 copper red
glaze recipe ... some of the pieces will turn puke pink to a pinky mauve
color. While there will be other pieces that are red... I have also noticed
that when this happens the copper red glaze is more opaque then usual I know
it must be how I am firing... Any ideas???
Pete...
Oklahoma City
Linfield College on tue 14 nov 00
on 11/13/00 8:53 PM, Helllll@AOL.COM at Helllll@AOL.COM wrote:
> Hello...
>
> I have had this happen in the past ... with more then one cone 10 copper red
> glaze recipe ... some of the pieces will turn puke pink to a pinky mauve
> color. While there will be other pieces that are red... I have also noticed
> that when this happens the copper red glaze is more opaque then usual I know
> it must be how I am firing... Any ideas???
It may be that the cooling was too fast for the reds to fully develop. It
may be that your claybody shows through, making that ick color more obvious.
And, could have the glaze on a bit thin, too. Melt might have been
insufficient to really get good reds. Any/all of the above can adversely
affect copper reds. So can other things - you'll get a laundry
list on this one. Might check the archives. Most help might come from
reading Tichane's "Copper Reds". Short course: the three part series in
Clay Times by Pete Pinnell on copper reds & their behaviors.
regards
Dannon Rhudy
David Hendley on tue 14 nov 00
Hey Pete, reds going to pink could be one of many things,
as Dannon says. I say the most likely is insufficient melt or
underfiring.
If you add more silica to a copper red glaze (and thus
reduce the relative amount of flux), it will make the
red go to pink.
--
David Hendley
Maydelle, Texas
hendley@tyler.net
http://www.farmpots.com/
----- Original Message -----
From: Linfield College
To:
Sent: Tuesday, November 14, 2000 11:57 AM
Subject: Re: Reds gone pink and mauve...
| on 11/13/00 8:53 PM, Helllll@AOL.COM at Helllll@AOL.COM wrote:
|
| > Hello...
| >
| > I have had this happen in the past ... with more then one cone 10 copper
red
| > glaze recipe ... some of the pieces will turn puke pink to a pinky mauve
| > color. While there will be other pieces that are red... I have also
noticed
| > that when this happens the copper red glaze is more opaque then usual I
know
| > it must be how I am firing... Any ideas???
|
| It may be that the cooling was too fast for the reds to fully develop. It
| may be that your claybody shows through, making that ick color more
obvious.
| And, could have the glaze on a bit thin, too. Melt might have been
| insufficient to really get good reds. Any/all of the above can adversely
| affect copper reds. So can other things - you'll get a laundry
| list on this one. Might check the archives. Most help might come from
| reading Tichane's "Copper Reds". Short course: the three part series in
| Clay Times by Pete Pinnell on copper reds & their behaviors.
|
| regards
|
| Dannon Rhudy
|
Paul Taylor on wed 15 nov 00
>> Hello...
>>
>> I have had this happen in the past ... with more then one cone 10 copper red
>> glaze recipe ... some of the pieces will turn puke pink to a pinky mauve
>> color. While there will be other pieces that are red... I have also noticed
>> that when this happens the copper red glaze is more opaque then usual I know
>> it must be how I am firing... Any ideas???
There are several reasons for the glaze to go pink .
I wrote this before, in more detail in the archives I think.
The tin? Your nuclei former has not dispersed through the glaze.
You did not fire high enough so forming to many nuclei. This makes rather
nasty purple and matt.
you did not reduce as much. Thus the glaze did not melt enough the small
percentage of iron not fluxing among other chemicals.
You cooled down too slow ,too many crystals, to big, this makes a spotty
purple red which can look nice or the purple matt froth - nasty stuff.
You fired too high and cooled too slow. can make a crimson.
If the glaze was a pink made by Sura, white with fine red spots it was the
first. If it gave the effect of raw liver it could have been any or a bit
of all the rest God knows.
If you can not adjust the firing adjust the tin and the grinding time and
or settling time . The trouble with modern kiln cycles and the use of tin
as a nuclei setter is that there is little room for error.
No more time - stew and dumplings tonight.
Regards from Paul Taylor
http://www.anu.ie/westportpottery
| |
|
