Ron and Mary Ernst on mon 8 feb 99
I want to thank everyone that contributed to my quest for the perfect =
Patti's
White. Thanks to Doug, Brad, Tom, Ron, David and Dave. My preliminary tests =
went
great. Every suggestion yielded a different product yet all of the glaze =
tests
turned out very well. Much, much better than my original Patti's white. =
Thank
you again. My plan is to see how they all work with my other studio glazes.
You were so effective I have another puzzle for you to solve...I hope. =
Here
is the recipe/formula for a glaze that we have used in our class studio with
incredibly variable results. Sometimes this glaze is awesome and =
interactions
with other glazes like Floating Blue, Randy's Red, Jade Blue are terrific =
and
sometimes this glaze just doesn't work. I know in a classroom setting many
things can happen to a glaze, but over the 2 years I have used this glaze, =
I
have come to love and hate it. My question to you (finally), is what makes =
it
vary so much througout an 8 week session? Is it all user application? (I =
don't
think so). Is there a way to make the glaze more stable or would we loose =
all
the wonderful interaction with other glazes. Is the amount of ZNO in the =
recipe
too high? Any thoughts or recommendations would be appreciated.
Creamy White
Whiting 19.5
Custer feldspar 53.5
EPK 16
Flint 5.8
Rutile 5.2
add
Zinc oxide 14.1
Thanks in advance=21=21=21
Dave Finkelnburg on wed 10 feb 99
Mary,
Couple of quick questions. How do the results with this glaze vary?
What do you see that you don't like?
Also, can you share your recipe for Jade Blue? I haven't tested
anything called that. I just did test Randy's Red and a Floating Blue
yesterday!
Looking at your creamy white, it does indeed look high in zinc, and also
low in silica.
Dave in Idaho where it's wet, windy and the snow looks soggy today!
-----Original Message-----
out some of the zinc (which is acting as a flux) From: Ron and Mary Ernst
To: CLAYART@LSV.UKY.EDU
Date: Tuesday, February 09, 1999 12:40 PM
Subject: Glaze help again, please!
----------------------------Original message----------------------------
I want to thank everyone that contributed to my quest for the perfect
Patti's
White. Thanks to Doug, Brad, Tom, Ron, David and Dave. My preliminary tests
went
great. Every suggestion yielded a different product yet all of the glaze
tests
turned out very well. Much, much better than my original Patti's white.
Thank
you again. My plan is to see how they all work with my other studio glazes.
You were so effective I have another puzzle for you to solve...I hope.
Here
is the recipe/formula for a glaze that we have used in our class studio with
incredibly variable results. Sometimes this glaze is awesome and
interactions
with other glazes like Floating Blue, Randy's Red, Jade Blue are terrific
and
sometimes this glaze just doesn't work. I know in a classroom setting many
things can happen to a glaze, but over the 2 years I have used this glaze,
I
have come to love and hate it. My question to you (finally), is what makes
it
vary so much througout an 8 week session? Is it all user application? (I
don't
think so). Is there a way to make the glaze more stable or would we loose
all
the wonderful interaction with other glazes. Is the amount of ZNO in the
recipe
too high? Any thoughts or recommendations would be appreciated.
Creamy White
Whiting 19.5
Custer feldspar 53.5
EPK 16
Flint 5.8
Rutile 5.2
add
Zinc oxide 14.1
Thanks in advance!!!
Ron Roy on wed 10 feb 99
Hi Ron and Mary,
First of all I think you should post those revisions to ClayArt with your
comments on how they worked. It is important to all of use to get feedback
on the glazes we never even see. It's how we will get better at this.
Yes - your are right - it's way oversupplied with ZnO and that is part of
the reason it reacts differently with other glazes. Even more important is
the low amount of SiO2. You can classify this glaze as unbalanced -
unsuitable for food bearing surfaces and very reactive with other glazes.
It's looking for some silica to melt at cone 6.
Its also gonna craze on just about any clay body.
If enough silica is added to make it a balanced glaze at cone 6 you will
not get the kind of inter-reaction you seem to be looking for and it will
still be oversupplied with ZnO.
In the meantine - I for one would like a description of my revision of
Patti's white and how it differs from the original - thanks.
RR
> You were so effective I have another puzzle for you to solve...I hope. Here
>is the recipe/formula for a glaze that we have used in our class studio with
>incredibly variable results. Sometimes this glaze is awesome and interactions
>with other glazes like Floating Blue, Randy's Red, Jade Blue are terrific and
>sometimes this glaze just doesn't work. I know in a classroom setting many
>things can happen to a glaze, but over the 2 years I have used this glaze, I
>have come to love and hate it. My question to you (finally), is what makes it
>vary so much througout an 8 week session? Is it all user application? (I don't
>think so). Is there a way to make the glaze more stable or would we loose all
>the wonderful interaction with other glazes. Is the amount of ZNO in the
>recipe
>too high? Any thoughts or recommendations would be appreciated.
>Creamy White
>Whiting 19.5
>Custer feldspar 53.5
>EPK 16
>Flint 5.8
>Rutile 5.2
> add
>Zinc oxide 14.1
>
>Thanks in advance!!!
Ron Roy
93 Pegasus Trail
Scarborough, Ontario
Canada M1G 3N8
Tel: 416-439-2621
Fax: 416-438-7849
Web page: http://digitalfire.com/education/people/ronroy.htm
stephen baxter on wed 10 feb 99
Ron:
try calcining the zinc. Put it in a bisque pot and fire it in the bisque.
This will reduce the water demand of the zinc and make it more stable.Raw
zinc can sometimes cause crawling which shows up in the glaze as uneven
streaks. It's my best guess all the other ingredients are pretty
dependable.
Steve
----------
From: Ron and Mary Ernst
To: CLAYART@LSV.UKY.EDU
Subject: Glaze help again, please!
Date: Monday, February 08, 1999 8:43 PM
----------------------------Original message----------------------------
I want to thank everyone that contributed to my quest for the perfect
Patti's
White. Thanks to Doug, Brad, Tom, Ron, David and Dave. My preliminary tests
went
great. Every suggestion yielded a different product yet all of the glaze
tests
turned out very well. Much, much better than my original Patti's white.
Thank
you again. My plan is to see how they all work with my other studio glazes.
You were so effective I have another puzzle for you to solve...I hope.
Here
is the recipe/formula for a glaze that we have used in our class studio
with
incredibly variable results. Sometimes this glaze is awesome and
interactions
with other glazes like Floating Blue, Randy's Red, Jade Blue are terrific
and
sometimes this glaze just doesn't work. I know in a classroom setting many
things can happen to a glaze, but over the 2 years I have used this glaze,
I
have come to love and hate it. My question to you (finally), is what makes
it
vary so much througout an 8 week session? Is it all user application? (I
don't
think so). Is there a way to make the glaze more stable or would we loose
all
the wonderful interaction with other glazes. Is the amount of ZNO in the
recipe
too high? Any thoughts or recommendations would be appreciated.
Creamy White
Whiting 19.5
Custer feldspar 53.5
EPK 16
Flint 5.8
Rutile 5.2
add
Zinc oxide 14.1
Thanks in advance!!!
----------
David Hewitt on wed 10 feb 99
The zinc oxide is a little higher than one normally sees, but I do not
think that this accounts for your problem. I would guess that your
problem may lie more with the rutile and the need to ensure that it is
well mixed / sieved before each application and that the thickness of
application is controlled to be the same. I would do a few tests on
these factors before altering the recipe.
David
In message , Ron and Mary Ernst writes
>----------------------------Original message----------------------------
> You were so effective I have another puzzle for you to solve...I hope. =
>Here
>is the recipe/formula for a glaze that we have used in our class studio with
>incredibly variable results. Sometimes this glaze is awesome and =
>interactions
>with other glazes like Floating Blue, Randy's Red, Jade Blue are terrific =
>and
>sometimes this glaze just doesn't work. I know in a classroom setting many
>things can happen to a glaze, but over the 2 years I have used this glaze, =
>I
>have come to love and hate it. My question to you (finally), is what makes =
>it
>vary so much througout an 8 week session? Is it all user application? (I =
>don't
>think so). Is there a way to make the glaze more stable or would we loose =
>all
>the wonderful interaction with other glazes. Is the amount of ZNO in the =
>recipe
>too high? Any thoughts or recommendations would be appreciated.
>Creamy White
>Whiting 19.5
>Custer feldspar 53.5
>EPK 16
>Flint 5.8
>Rutile 5.2
> add
>Zinc oxide 14.1
>
>Thanks in advance=21=21=21
>
--
David Hewitt
David Hewitt Pottery ,
7 Fairfield Road, Caerleon, Newport,
South Wales, NP6 1DQ, UK. Tel:- +44 (0) 1633 420647
FAX:- +44 (0) 870 1617274
Own Web site http://www.dhpot.demon.co.uk
IMC Web site http://digitalfire.com/education/people/hewitt.htm
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