Stephani Stephenson on tue 16 sep 03
Don't know what is in your glaze, but tin can affect the
color, tone and tactile quality of a glaze,
esp if it is interacting with chrome, color wise.
So subbing zircopax may change it a bit.
Tin is a lot more expensive as well,
Stephani Stephenson
steph@alchemiestudio.com
John Britt on tue 16 sep 03
You can subsititute zircopax for tin but you will not get the same results
regardless of the proportions you use or the amount of silica you reduce
from the recipe. They are two different materials and have different
properties. They both will opacify a glaze, as will titanium, but each
will look distinctly different.
John Britt
Logan Oplinger on thu 18 sep 03
I have been following this topic with a bit of interest.
If one wants to retain the other properties of tin oxide other than its
opacifying power (i.e. reaction with metal oxides, color tone, etc.) is it
posible to do a partial substitution with zircopax, and if so, at what
proportion?
Logan Oplinger
Another Pacific Island
Lat. 13.28 N, Long. 144.45 E.
Ababi on thu 18 sep 03
My point of view is: What kind of white do I want?
For matte or warm white homey cozy, I use tin.
When I want sharp with self power strong expression I choose ultrox.
About your question:
If I have understood correctly RR words the silica in the ultrox does
not take place in the glaze matrix, however I consider it as it is,
because I want to remove it's shin in order to make it "tin like": When
I sub it I double the amount and remove the extra silica that I get from
the ultrox.
In my case. I do it mostly the other way around!
Using other materials to imitate ultrox.
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 Logan
Oplinger
Sent: Thursday, September 18, 2003 8:07 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Can zircopax be substituted for tin oxide?
I have been following this topic with a bit of interest.
If one wants to retain the other properties of tin oxide other than its
opacifying power (i.e. reaction with metal oxides, color tone, etc.) is
it
posible to do a partial substitution with zircopax, and if so, at what
proportion?
Logan Oplinger
Another Pacific Island
Lat. 13.28 N, Long. 144.45 E.
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julie milazzo on tue 23 sep 03
Hey Logan and all who have helped with this thread,
After asking this question last week, I got a bunch of great advice (thanks everyone!), and may have a little information to offer. I neede one pound, ten ounces of tin oxide for my recipe, which is a cone ten glaze called grey bird. It fires a pale gunmetal at total reduction, sometimes with hints of cranberry where thick, and mustard where thin. In oxidation it has a pretty pale green sheen with spots of black or grey, in small crystal form.
I only had one pound of tin, so I used it all, and then threw in a pound of the zircopax. In my firing, the glaze came out beautiful. I lightly reduced, and got a pale green, but where I got the grey crystals, it almost looks like there's rutile in the glaze. It's a bit streaky; quite nice.
I wish I could say for sure that it was the zircopax that caused the rutile-like effect, but this glaze is different in every firing, so there's no way to be sure. I wish I had fired more stuff in this glaze. All the best with your research1 Jules
Logan Oplinger wrote:
I have been following this topic with a bit of interest.
If one wants to retain the other properties of tin oxide other than its
opacifying power (i.e. reaction with metal oxides, color tone, etc.) is it
posible to do a partial substitution with zircopax, and if so, at what
proportion?
Logan Oplinger
Another Pacific Island
Lat. 13.28 N, Long. 144.45 E.
______________________________________________________________________________
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
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Britt Britt on tue 23 sep 03
Logan,
This is a good example of the maximum not fitting the specific
application. Tin is usually considered twice as strong an opacifier as
zircopax. (although the temperature and atmosphere is not specified)
But at cone 10 in heavy reduction Tin loses its opacifying power. (See
Hamer) It actually becomes a misty grey and the surface can become rough,
like sandpaper.
Thanks for the results,
John Britt
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