Patty Kaliher on thu 28 jun 07
I was given a 5 gallon bucket of Georgie's cone 6 Clear Glaze. It crazes on
my porcelain pots. I contacted Georgie's for a recommended fix. The reply
was
"Unfortunately, there is nothing you can do to change the glaze fit of this
glaze to work for porcelain. Porcelain requires unique and highly
specialized glaze products as most porcelains have very low rates of
expansion."
I hate the idea of throwing out a half a bucket of glaze. Any ideas? Also,
any recommended recipes for a clear glaze for porcelain cone 6. I'm using
Standard's 601.
Thanks,
Patty Kaliher
Patty@PattyKaliher.com
Ron Roy on thu 28 jun 07
Hi Patty,
Take a couple of cups of the glaze - well stirred - and add 10 grams of
silica - sieve - dip a test tile - then add another 10 grams of silica -
sieve - dip a tile - add another 10 grams - either the crazing will stop or
the glaze will stop melting properly.
If you know how much silica to add to two cups of glaze - you can figure
out how much to add to the bucket.
RR
>I was given a 5 gallon bucket of Georgie's cone 6 Clear Glaze. It crazes on
>my porcelain pots. I contacted Georgie's for a recommended fix. The reply
>was
>
>"Unfortunately, there is nothing you can do to change the glaze fit of this
>glaze to work for porcelain. Porcelain requires unique and highly
>specialized glaze products as most porcelains have very low rates of
>expansion."
>
>I hate the idea of throwing out a half a bucket of glaze. Any ideas? Also,
>any recommended recipes for a clear glaze for porcelain cone 6. I'm using
>Standard's 601.
>
>Thanks,
>
>Patty Kaliher
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
RJ Shulenburg on thu 28 jun 07
Throw it out and move on. Life is to short to deal with large buckets of bad
glazes.
Ronda in Virginia
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Patty Kaliher
Sent: Thursday, June 28, 2007 11:43 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Clear Glaze for porcelain.
I was given a 5 gallon bucket of Georgie's cone 6 Clear Glaze. It crazes on
my porcelain pots. I contacted Georgie's for a recommended fix. The reply
was
"Unfortunately, there is nothing you can do to change the glaze fit of this
glaze to work for porcelain. Porcelain requires unique and highly
specialized glaze products as most porcelains have very low rates of
expansion."
I hate the idea of throwing out a half a bucket of glaze. Any ideas? Also,
any recommended recipes for a clear glaze for porcelain cone 6. I'm using
Standard's 601.
Thanks,
Patty Kaliher
Patty@PattyKaliher.com
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Paul Lewing on thu 28 jun 07
On Jun 28, 2007, at 8:43 AM, Patty Kaliher wrote:
I was given a 5 gallon bucket of Georgie's cone 6 Clear Glaze. It
crazes on
my porcelain pots.
I'm going to assume you have this glaze mixed up wet if you've
already tested it. The easiest way to lower the COE of a glaze (and
with midrange glazes that don't fit, it's almost always that you need
to lower the COE rather than raise it) is to add silica. There's no
telling how much if you don't know the recipe, but you can
experimentally determine how much will do it. HOwever, this may make
the glaze glossier as well.
Take a set volume of wet glaze, say 100 cc's or 1 cup or something
convenient, and add silica to that in small increments, maybe 2 grams
at a time, testing at each increment, until you've added maybe 12-16%
silica. One of these should fit pretty well. Of course, you will
never know the recipe for the fixed glaze, but you will know how to
duplicate it, which is all you really want.
You might also take small batches of this same size and add various
colorants to it. You may very well find that some color variation
looks good and also fits well.
Paul Lewing
www.paullewingtile.com
Lois Ruben Aronow on thu 28 jun 07
I don't believe Standard makes a #601. The ^6 porcelains are 213, 551 and
365. Double check your # or your manufacturer.
Regardless, this was a silly answer. Commercial glazes, however, generally
contain gums. Without knowing exactly what the recipe was for the glaze, it
would be difficult to determine what you needed to do to adjust it.
You might want to save the glazes for something else and start testing your
own glazes.
..Lo
**********
Lois Aronow Ceramics
Brooklyn, NY
www.loisaronow.com
www.craftsofthedamned.blogspot.com
> -----Original Message-----
> From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of
> Patty Kaliher
> Sent: Thursday, June 28, 2007 11:43 AM
> To: CLAYART@LSV.CERAMICS.ORG
> Subject: Clear Glaze for porcelain.
>
> I was given a 5 gallon bucket of Georgie's cone 6 Clear
> Glaze. It crazes on my porcelain pots. I contacted
> Georgie's for a recommended fix. The reply was
>
> "Unfortunately, there is nothing you can do to change the
> glaze fit of this glaze to work for porcelain. Porcelain
> requires unique and highly specialized glaze products as most
> porcelains have very low rates of expansion."
>
> I hate the idea of throwing out a half a bucket of glaze.
> Any ideas? Also, any recommended recipes for a clear glaze
> for porcelain cone 6. I'm using Standard's 601.
>
> Thanks,
>
> Patty Kaliher
> Patty@PattyKaliher.com
>
> ______________________________________________________________
> ________________
> 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.
Patty Kaliher on fri 29 jun 07
Standard used to make a #601. It is the cone 6 version of Tom Turner's
recipe. They last made it in 2005 and still have about 4000 lb in the
warehouse. They have not been able to sell it to schools because while
still wet it tends to get very hard. So they have stopped making it and
marketing it. I throw the bag of clay on the floor a few times and it works
fine.
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Lois Ruben
Aronow
Sent: Thursday, June 28, 2007 5:50 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Clear Glaze for porcelain.
I don't believe Standard makes a #601. The ^6 porcelains are 213, 551 and
365. Double check your # or your manufacturer.
Regardless, this was a silly answer. Commercial glazes, however, generally
contain gums. Without knowing exactly what the recipe was for the glaze, it
would be difficult to determine what you needed to do to adjust it.
You might want to save the glazes for something else and start testing your
own glazes.
..Lo
**********
Lois Aronow Ceramics
Brooklyn, NY
www.loisaronow.com
www.craftsofthedamned.blogspot.com
> -----Original Message-----
> From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of
> Patty Kaliher
> Sent: Thursday, June 28, 2007 11:43 AM
> To: CLAYART@LSV.CERAMICS.ORG
> Subject: Clear Glaze for porcelain.
>
> I was given a 5 gallon bucket of Georgie's cone 6 Clear
> Glaze. It crazes on my porcelain pots. I contacted
> Georgie's for a recommended fix. The reply was
>
> "Unfortunately, there is nothing you can do to change the
> glaze fit of this glaze to work for porcelain. Porcelain
> requires unique and highly specialized glaze products as most
> porcelains have very low rates of expansion."
>
> I hate the idea of throwing out a half a bucket of glaze.
> Any ideas? Also, any recommended recipes for a clear glaze
> for porcelain cone 6. I'm using Standard's 601.
>
> Thanks,
>
> Patty Kaliher
> Patty@PattyKaliher.com
>
> ______________________________________________________________
> ________________
> 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.
____________________________________________________________________________
__
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.
Snail Scott on mon 2 jul 07
Sent: Thursday, June 28, 2007 11:43 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Clear Glaze for porcelain.
>...I was given a 5 gallon bucket of Georgie's cone 6 Clear Glaze. It crazes on
my porcelain pots.I hate the idea of throwing out a half a bucket of glaze. Any ideas? Also,
any recommended recipes for a clear glaze for porcelain cone 6...
Make some stoneware work to use it on!
I had a similar issue many years ago, when I first
started using porcelain, and my normal ^6 clear
didn't fit it. That recipe originally came from
James Chappell's book, so I went back to Chappell
to look for a porcelain-compatible recipe, and there
it was! and it was the same recipe as the stoneware
glaze, but with One Big Change.
That was one of those 'Now I get it!' moments for
me, in the way that it isolated one element and
showed so clearly the result of changing it.
My recipes (and Chappell's book) are in the studio
at the moment, and I'm not (Bad Snail, no bisquit!),
so I can't dig out the exact recipe now, but if
you haven't found one soon, I'll look for it. It's
gerstley-based, though, so you may want to keep
looking.
-Snail
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