tgschs10 on thu 15 jun 00
I'm looking for a cone 9-10 matt glaze that is (1) clear, (2) =
transparent and (3) allows the underlying colored slip to show thru.
As a related aside, I recently pulled out Conrad's book for a clear and =
transparent cone 9-10 gloss glaze to put over colored slips and was =
disappointed when fired because the clear and trasparent glaze =
completely covered the underlying colored slip. I then went back to his =
book and find that this glaze is listed as clear and transparent but =
also as not allowing stain penetration. Now I am really puzzled because =
I assumed that a clear and transparent glaze would allow me to see the =
underlying stain. Can someone explain this terminology?
Jeanne Wood on sat 17 jun 00
Hi Tgschs,
(How do you pronounce that ;-) ?
The glaze I know of that seems most likely to fit your
needs is Tom Coleman's "No Craze White". Taken from
"Studio Potter" Magazine vol 6 #2. It's great for use
with underglaze or overglaze painting.
I've used it successfully in oxidation and reduction.
I've found better results at ^10 than ^9.
No Craze White (semi matt) ^9-11
Custer feldspar...........20
Whiting...................11
Talc......................11
Calcined kaolin...........17
Silica....................20
Alumina....................4
Superpax...................6.5
Bone Ash...................5
Ball Clay..................6
Regards,
Jeanne W.
Enjoying an almost perfect June morning.
--- tgschs10 wrote:
> I'm looking for a cone 9-10 matt glaze that is (1)
> clear, (2) transparent and (3) allows the underlying
> colored slip to show thru.
> As a related aside, I recently pulled out Conrad's
> book for a clear and transparent cone 9-10 gloss
> glaze to put over colored slips and was disappointed
> when fired because the clear and trasparent glaze
> completely covered the underlying colored slip. I
> then went back to his book and find that this glaze
> is listed as clear and transparent but also as not
> allowing stain penetration. Now I am really puzzled
> because I assumed that a clear and transparent glaze
> would allow me to see the underlying stain. Can
> someone explain this terminology?
>
>
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ronnie beezer on mon 10 may 04
By mistake I purchased 5 gallons of matt white cone 6 glaze, instead of white gloss finish. I would like to know if there is any way that I can change it to make it glossy. I've used it on some pots and applied clear glaze on top to give it a shine. I'm trying to avoid the double process.
Thanks,
Ronnie
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Alisa Liskin Clausen on thu 13 may 04
On Mon, 10 May 2004 05:13:36 -0700, ronnie beezer
wrote:
>By mistake I purchased 5 gallons of matt white cone 6 glaze, instead of
white gloss finish. I would like to know if there is any way that I can
change it to make it glossy. I've used it on some pots and applied clear
glaze on top to give it a shine. I'm trying to avoid the double process.
>Thanks,
>Ronnie
>
>
Dear Ronnie,
I am thinking that you bought premixed glaze that is already hydrated
because you wrote 5 gallons.
If I am wrong, and it is powdered, you can make a line blend as follows to
achieve the amount of gloss you desire in the glaze:
Ask you supplier for a gloss clear that is close in the formula of the
glaze you bought. Many times, suppliers use a base for the clear that is
altered to make it white or mat.
Make a line test starting with 100% clear glaze, then go across the board
with increments of 10% until you reach 100% mat white.
Start with 100gm clear, then 90gm clear and 10gm white mat, then 20gm clear
and 80gm white mat until you reach 100gm mat white.
You will see from your tests what percent pair makes the glaze surface you
want. You can do the same line blend with the mat white and a frit like
3134, or Gerstely Borate.
If the premixed glaze is already hydrated, I do not know how you can make
accurate tests. I suppose you could mix your two premixed glazes (if you
get the clear also hydrated) by weight if you make a careful viscosity test
on the batches to be blended and record that for your actual big batch.
Again, this is part for me is pure speculation.
Hope the glaze you bought is dry.
regards from Alisa in Denmark
ronnie beezer on thu 27 may 04
I have 5 gallons of white matt ^ 6 glaze and I would like to know if there is any way that it can be changed to a glossy white.
Thank you,
Ronnie
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Dave Finkelnburg on fri 28 may 04
Ronnie,
Yes, this glaze can be made glossy. No question about it. It will take
a bit of time and effort, though. I don't mean to make this more
complicated than it is, but there are some things you need to understand to
get the glossy glaze you want.
Do you know the recipe for the glaze?
If you do, it will be possible to use glaze calculation software to work
out what ingredients to add to make the glaze glossy.
If you do not have the recipe, it is still possible to make the glaze
glossy, but you will have to mix some glaze tests and fire some small test
tiles. You probably need to do that anyway.
There are, generally speaking, three possible matt glazes. You might
have what I call a "true matt," or you might have an "alumina matt" or a
"silica matt." The latter two are high in alumina, or silica, and are
underfired. For those you add some flux. The true matt is high in flux.
For it you add silica.
Of course, if you add flux the glaze expansion may go up and cause
crazing. If you add silica, the glaze expansion will drop, guaranteed, and
you may get shivering.
Assuming you have a true matt glaze, the best test would be to do a line
blend between your matt glaze and your matt glaze plus some silica. Then
fire test tiles of each of the blends and examine the results.
This is oversimplified, but I hope it gives you some ideas to start.
Good glazing!
Dave Finkelnburg on a gorgeous, Pacific coastal weather system
drizzle dampened morning in Idaho, where the rain has again washed the
lovely lavender flowers of the Dame's Rocket and they are showing off their
petals in an especially fine display. These upright members of the mustard
family make lots of seed and plant themselves more or less where they want
in the garden visible from the window to this room...guess that sort of
makes them "free range" flowers...which is fine because they intermingle
with the oriental poppies that move around the garden also...they will be
blooming red and orange soon...both species apparently stretching up to hide
the yellow and brown and rust wallflowers back behind them...fortunately
the daisies are far enough to the front to still show off...
----- Original Message -----
From: "ronnie beezer"
Sent: Thursday, May 27, 2004 9:30 PM
> I have 5 gallons of white matt ^ 6 glaze and I would like to know if there
is any way that it can be changed to a glossy white.
> Thank you,
> Ronnie
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