Pat Southwood on thu 4 sep 03
Hi,
Sorry Ted, I will have to disagree, 5% is just fine for localised red'n. =
If I want a surface like the moon I use up to 20% and fire in red'n.
To quote Harry Fraser ( I hope you are all bowing with due respect =
now.......)
"reducing atmospheres in an electric kiln considerably shorten element =
life and consequently the ability to reduce a glaze whilst firing in an =
oxidising atmosphere is of particular interest to potters firing by =
electricity...............speckled reds from reduced copper oxide can be =
obtained relativly easily...........
.......a good starting point for experiments would be up to 5% of copper =
or iron oxide and 3 - 8% of silicon carbide in a leadless glaze." =20
Taken from "Glazes for the craft potter" by Harry Fraser, page 69. =
isbn 0713651415
I spent at least 2 years experimenting with surface texture with silicon =
carbide and magnesium carbonate. Never did I wreck a glaze shelf. If you =
are worried, try it on the inside of a shallow bowl and see where it =
ends up.=20
B.T.W one can also obtain a localised red'n using in -glaze lustres, =
using lavender oil and turpentine as thinners.
Pat.
pat@southwood4.fsnet.co.u
Ababi on fri 5 sep 03
Hi guy and girls!
Do not quote so much! Test and you will know the answers!
Up to 2% SiC in a clear gloss copper glaze might give you reduction:
http://members4.clubphoto.com/ababi306910/186015/
slide #8
Thanks to Tom Buck for the explanations In the archives and personal.
In an old CM I have seen an interesting way, instead of adding to the
glaze, brushing on the glaze. I think it looks better.
For craters the same look 1-5 Sic #100
http://members4.clubphoto.com/ababi306910/185990/
the first slide
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-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Pat
Southwood
Sent: Thursday, September 04, 2003 8:08 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: oxidisation to look like reduction, - silicon carbide
Hi,
Sorry Ted, I will have to disagree, 5% is just fine for localised red'n.
If I want a surface like the moon I use up to 20% and fire in red'n.
To quote Harry Fraser ( I hope you are all bowing with due respect
now.......)
"reducing atmospheres in an electric kiln considerably shorten element
life and consequently the ability to reduce a glaze whilst firing in an
oxidising atmosphere is of particular interest to potters firing by
electricity...............speckled reds from reduced copper oxide can be
obtained relativly easily...........
.......a good starting point for experiments would be up to 5% of copper
or iron oxide and 3 - 8% of silicon carbide in a leadless glaze."
Taken from "Glazes for the craft potter" by Harry Fraser, page 69.
isbn 0273009397
I spent at least 2 years experimenting with surface texture with silicon
carbide and magnesium carbonate. Never did I wreck a glaze shelf. If you
are worried, try it on the inside of a shallow bowl and see where it
ends up.
B.T.W one can also obtain a localised red'n using in -glaze lustres,
using lavender oil and turpentine as thinners.
Pat.
pat@southwood4.fsnet.co.uk
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