WALLY ASSELBERGHS on fri 26 oct 01
A nice lady at my art academy has recipe in her notebook for celadon =
stoneware glaze :
31 feldspar (kali)
7 china clay
14 whiting
33 quartz
12 talc
and......
R-Y OX 3 pct
This would be recipe from Ian Gregory
QUESTION :
- does anyone know temperature of this recipe ?
- any idea which oxyde "R-Y" might be ?
- anyone have any experience with this glaze ?
apply thick/thin ? long/short soak ?
heavy reduction needed ?
Thanks for any tip-help-advice.
You would make this lady very happy, she's
a true glaze addict.....
Wally
wally.asselberghs@pi.be
Wade Blocker on fri 26 oct 01
For a celadon /glaze in reduction the usual addition is that of iron oxide.
I would guess that the author meant a yellow or red iron oxide addition.
Mia in ABQ
Ababi on fri 26 oct 01
Probably RIO: RED Yron Oxide 3%
It will melt in ^6 might be toward matte because of high magnesia and silica
Ababi Sharon
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
http://www.israelceramics.org/
----- Original Message -----
From: "WALLY ASSELBERGHS"
To:
Sent: Friday, October 26, 2001 07:30
Subject: SOS - UNKNOWN OXIDE
A nice lady at my art academy has recipe in her notebook for celadon
stoneware glaze :
31 feldspar (kali)
7 china clay
14 whiting
33 quartz
12 talc
and......
R-Y OX 3 pct
This would be recipe from Ian Gregory
QUESTION :
- does anyone know temperature of this recipe ?
- any idea which oxyde "R-Y" might be ?
- anyone have any experience with this glaze ?
apply thick/thin ? long/short soak ?
heavy reduction needed ?
Thanks for any tip-help-advice.
You would make this lady very happy, she's
a true glaze addict.....
Wally
wally.asselberghs@pi.be
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Craig Martell on fri 26 oct 01
Hello Wally:
I looked at the seger formula of this glaze with Insight and Matrix. Both
programs tell me that it's most likely a cone 10 glaze. It's a bit out of
whack though. A bit low in alumina and also short of KNaO for a cone 10
glaze. It also has a very low expansion and I would watch for shivering on
some bodies. This is probably due to the Magnesia being close to the upper
limit. If you increased the feldspar a bit the alumina and KNaO would
probably start to fall in, or closer to, accepted limits. I calculated the
glaze with potash feldspar for the record. You didn't state a specific
type in your query and it does make a difference.
The R-Y Ox at 3 pct is most likely red or yellow iron oxide at 3 percent.
regards, Craig Martell in Oregon
Dale Neese on fri 26 oct 01
From the notes on the celadon recipe I would expect the R is for Red Iron
Oxide and the Y is for Yellow Iron Oxide. You could substitute either one in
this glaze at 3%. Test and compare on Porcelain or white stoneware. Maybe a
stoneware clay covered by a grolleg porcelain slip. Several test tiles,
different clays and Oxide ingredients placed around in the kiln will help
you decide which direction to go before committing to mixing a bucket full.
Keep good notes as to which tile is which.
Good luck,
Dale Tex
WALLY ASSELBERGHS on mon 29 oct 01
Ababi , Dale, Craig, Wade, Ron
Many thanks for your help on Celadon glaze !!!.
Lady Eliane will be delighted.
Feels real nice to get this kind of support
Best regards
Wally.
wally.asselberghs@pi.be
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