Brad Carter on thu 7 sep 06
I did some cone 6 glaze testing--all on off-white mid-range stoneware--and
got several matt glazes I like. They are from four different recipes. There
is a tan, blue and green from one base with different additives; there is a
yellow from another recipe; Weathered Bronze Green is another; and a bright
turquoise from another recipe which is a varient of the Weathered Bronze Green
recipe. I'd like to try to "merge" them all into one base glaze with various
additives that give me these same colors, all with a satin matt texture. This
task seems a bit overwhelming to me--not sure where to start. I do have
GlazeMaster, although I just installed it and have only just started to use it.
I'd very much appreciate any advice/suggestions/general guidelines on how to
proceed with this.
Following are the recipes including my comments about what I like and dislike
about the glazes.
Glaze #1 Purple Opal
Color: Tan or blue or green (not sure why it is called "Purple"??)
Source: ClayArt 2-16-05
test by Alisa Clausen
Gerstley Borate 14
Spodumene 30
EPK 5
Dolomite 7
Talc 13
Silica 20
for tan colored glaze add:
Rutile 6
Manganese diox 1
for blue color glaze add:
Rutile 6
Cobalt Carb 2
for green color glaze add:
Rutile 6
Copper Carb 5
Like: the three different colors (tan, blue and green) are all fairly good
and distinct from one another. They make a nice family of glazes. They
also break darker along edges, which highlights surface textures of the ware.
However . . .
Dislike: the glaze is a bit too matt in texture. That is, it feels slightly
rough to the touch. I'd like it to be smoother--with a satin texture.
Also I don't want to rely on Gerstly Borate as an ingredient.
--------------------------------------------------------------
Glaze #2 Butterscotch
color: yellow
Source: ClayArt 3-26-05
test by Alisa Clausen
Frit 3134 20
Spodumene 20
Dolomite 20
Ball Clay 20
Silica 20
add:
Titanium diox 10
Rutile 6
Like: Nice bright yellow with smooth satin matt texture. Uses Frit
instead of GB. However . . .
Dislike: On my light-colored clay body, this glaze does not break darker--and
thus doesn't highlight texture in te underlying ware very well. I'd like it
to break darker where thin.
---------------------------------------------------------------
Glaze #3 Weathered Bronze Green
color: green
Source: John Hesselbreth/Pete Pinnell
Neph. syenite 60
Strontium carb 20
Lithium carb 1
Ball Clay 10
Silica 9
add:
Titanium diox 10
Copper carb 5
Like: Nice bright medium green with smooth satin matt texture. Readily
breaks darker along edges, which highlights surface textures of the ware.
However . . .
Dislike: There is not much I don't like about this glaze.
Note: ClayArt 10 Apr 1996, from: fmiranda@alpha.cc.oberlin.edu
the sender stated that the following colors can be created from the strontium
matt glaze above :
for periwinkle blue add:
Cobalt carb .15
Copper carb 4
for dark mottled green add:
copper carb 8
for cream/tan add:
Rutile 6
for charcole add:
Manganese diox 2
Copper carb 5
__________________________________________
Glaze #4 Turquoise
color: turquiose
Source: ClayArt Feb 19 2005, John Anthony
Neph. syenite 61.54
Strontium carb 20.88
Lithium carb 3.3
Ball Clay 6.59
Silica 7.69
add:
Copper carb 3.5
Bentonite 4.0
Like: Bright blue green turqoise. However . . .
Dislike: Very rough scratchy matt. No breaking at all on edges. I'd like
to retain the color, but change the texture to satin and get it to break
darker on edges.
__________________________________________
Brad Carter
Grass Valley, Calif
Ron Roy on fri 8 sep 06
Hi Brad,
First glaze only totals to 89 - is that right? - if so the expansion is way
too low,
Not hard to raise it subbing in spar for Spod - do you have a calculation
program? It would not be hard to change the boron source to F 3134 as well.
Let me know if the recipe is right.
The butterscotch expansion is a little low - again east to fix - short of
silica so it's not a stable glaze. You may find a slow cool will really
help the way it looks.
The Weathered Bronze Green has a high expansion - it may be crazing - slow
cooling will have a big effect I think.
Turquoise - A variation of the Weathered Bronze - expansion even higher -
either add some 3134 and/or silica.
If you are really quick I might be able to make some suggestions but I am
getting ready to leave on a trip to the west coast.
RR
>I did some cone 6 glaze testing--all on off-white mid-range stoneware--and
>got several matt glazes I like. They are from four different recipes. There
>is a tan, blue and green from one base with different additives; there is a
>yellow from another recipe; Weathered Bronze Green is another; and a bright
>turquoise from another recipe which is a varient of the Weathered Bronze Green
>recipe. I'd like to try to "merge" them all into one base glaze with various
>additives that give me these same colors, all with a satin matt texture. This
>task seems a bit overwhelming to me--not sure where to start. I do have
>GlazeMaster, although I just installed it and have only just started to use it.
>I'd very much appreciate any advice/suggestions/general guidelines on how to
>proceed with this.
>
>Following are the recipes including my comments about what I like and dislike
>about the glazes.
>
>Glaze #1 Purple Opal
>
>Color: Tan or blue or green (not sure why it is called "Purple"??)
>
>Source: ClayArt 2-16-05
>test by Alisa Clausen
>
>Gerstley Borate 14
>Spodumene 30
>EPK 5
>Dolomite 7
>Talc 13
>Silica 20
>
>for tan colored glaze add:
>Rutile 6
>Manganese diox 1
>
>for blue color glaze add:
>Rutile 6
>Cobalt Carb 2
>
>for green color glaze add:
>Rutile 6
>Copper Carb 5
>
>Like: the three different colors (tan, blue and green) are all fairly good
>and distinct from one another. They make a nice family of glazes. They
>also break darker along edges, which highlights surface textures of the ware.
>However . . .
>
>Dislike: the glaze is a bit too matt in texture. That is, it feels slightly
>rough to the touch. I'd like it to be smoother--with a satin texture.
>Also I don't want to rely on Gerstly Borate as an ingredient.
>--------------------------------------------------------------
>
>Glaze #2 Butterscotch
>
>color: yellow
>
>Source: ClayArt 3-26-05
>test by Alisa Clausen
>
>Frit 3134 20
>Spodumene 20
>Dolomite 20
>Ball Clay 20
>Silica 20
>
>add:
>Titanium diox 10
>Rutile 6
>
>Like: Nice bright yellow with smooth satin matt texture. Uses Frit
>instead of GB. However . . .
>
>Dislike: On my light-colored clay body, this glaze does not break darker--and
>thus doesn't highlight texture in te underlying ware very well. I'd like it
>to break darker where thin.
>---------------------------------------------------------------
>
>Glaze #3 Weathered Bronze Green
>
>color: green
>
>Source: John Hesselbreth/Pete Pinnell
>
>Neph. syenite 60
>Strontium carb 20
>Lithium carb 1
>Ball Clay 10
>Silica 9
>
>add:
>Titanium diox 10
>Copper carb 5
>
>Like: Nice bright medium green with smooth satin matt texture. Readily
>breaks darker along edges, which highlights surface textures of the ware.
>However . . .
>
>Dislike: There is not much I don't like about this glaze.
>
>Note: ClayArt 10 Apr 1996, from: fmiranda@alpha.cc.oberlin.edu
>the sender stated that the following colors can be created from the strontium
>matt glaze above :
>
>for periwinkle blue add:
>Cobalt carb .15
>Copper carb 4
>
>for dark mottled green add:
>copper carb 8
>
>for cream/tan add:
>Rutile 6
>
>for charcole add:
>Manganese diox 2
>Copper carb 5
>
>__________________________________________
>
>Glaze #4 Turquoise
>
>color: turquiose
>
>Source: ClayArt Feb 19 2005, John Anthony
>
>Neph. syenite 61.54
>Strontium carb 20.88
>Lithium carb 3.3
>Ball Clay 6.59
>Silica 7.69
>
>add:
>Copper carb 3.5
>Bentonite 4.0
>
>Like: Bright blue green turqoise. However . . .
>
>Dislike: Very rough scratchy matt. No breaking at all on edges. I'd like
>to retain the color, but change the texture to satin and get it to break
>darker on edges.
>__________________________________________
>
>
>Brad Carter
>Grass Valley, Calif
>
>______________________________________________________________________________
>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.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Mayssan Shora Farra on fri 8 sep 06
Hello Brad:
I don't know much about glazes but I have been using the Purple Opalesence
sine I started pottery 12 years ago ( the recipe I have is just a little
different in the amounts).
I use it exclusively to make glazes run, some more than others and it
makes beautiful revulets and variatons in the glaze under it some of these
are purple and sorta opalescent thus the name I think.
And that is all I know.
Mayssan,
Sitting here in the wondeful weather we are having in Charleston, WV USA
http://www.clayvillepottery.com
Gene & Dolita Dohrman on fri 8 sep 06
Brad, Thank you for sharing this. You have done a lot of work. I haven't
had time to go through everything but I save it all to a word document.
Dolita
----- Original Message -----
From: "Brad Carter"
To:
Sent: Thursday, September 07, 2006 9:57 PM
Subject: family of matt glazes
> I did some cone 6 glaze testing--all on off-white mid-range stoneware--and
> got several matt glazes I like. They are from four different recipes.
There
> is a tan, blue and green from one base with different additives; there is
a
> yellow from another recipe; Weathered Bronze Green is another; and a
bright
> turquoise from another recipe which is a varient of the Weathered Bronze
Green
> recipe. I'd like to try to "merge" them all into one base glaze with
various
> additives that give me these same colors, all with a satin matt texture.
This
> task seems a bit overwhelming to me--not sure where to start. I do have
> GlazeMaster, although I just installed it and have only just started to
use it.
> I'd very much appreciate any advice/suggestions/general guidelines on how
to
> proceed with this.
>
> Following are the recipes including my comments about what I like and
dislike
> about the glazes.
>
> Glaze #1 Purple Opal
>
> Color: Tan or blue or green (not sure why it is called "Purple"??)
>
> Source: ClayArt 2-16-05
> test by Alisa Clausen
>
> Gerstley Borate 14
> Spodumene 30
> EPK 5
> Dolomite 7
> Talc 13
> Silica 20
>
> for tan colored glaze add:
> Rutile 6
> Manganese diox 1
>
> for blue color glaze add:
> Rutile 6
> Cobalt Carb 2
>
> for green color glaze add:
> Rutile 6
> Copper Carb 5
>
> Like: the three different colors (tan, blue and green) are all fairly
good
> and distinct from one another. They make a nice family of glazes. They
> also break darker along edges, which highlights surface textures of the
ware.
> However . . .
>
> Dislike: the glaze is a bit too matt in texture. That is, it feels
slightly
> rough to the touch. I'd like it to be smoother--with a satin texture.
> Also I don't want to rely on Gerstly Borate as an ingredient.
> --------------------------------------------------------------
>
> Glaze #2 Butterscotch
>
> color: yellow
>
> Source: ClayArt 3-26-05
> test by Alisa Clausen
>
> Frit 3134 20
> Spodumene 20
> Dolomite 20
> Ball Clay 20
> Silica 20
>
> add:
> Titanium diox 10
> Rutile 6
>
> Like: Nice bright yellow with smooth satin matt texture. Uses Frit
> instead of GB. However . . .
>
> Dislike: On my light-colored clay body, this glaze does not break
darker--and
> thus doesn't highlight texture in te underlying ware very well. I'd like
it
> to break darker where thin.
> ---------------------------------------------------------------
>
> Glaze #3 Weathered Bronze Green
>
> color: green
>
> Source: John Hesselbreth/Pete Pinnell
>
> Neph. syenite 60
> Strontium carb 20
> Lithium carb 1
> Ball Clay 10
> Silica 9
>
> add:
> Titanium diox 10
> Copper carb 5
>
> Like: Nice bright medium green with smooth satin matt texture. Readily
> breaks darker along edges, which highlights surface textures of the ware.
> However . . .
>
> Dislike: There is not much I don't like about this glaze.
>
> Note: ClayArt 10 Apr 1996, from: fmiranda@alpha.cc.oberlin.edu
> the sender stated that the following colors can be created from the
strontium
> matt glaze above :
>
> for periwinkle blue add:
> Cobalt carb .15
> Copper carb 4
>
> for dark mottled green add:
> copper carb 8
>
> for cream/tan add:
> Rutile 6
>
> for charcole add:
> Manganese diox 2
> Copper carb 5
>
> __________________________________________
>
> Glaze #4 Turquoise
>
> color: turquiose
>
> Source: ClayArt Feb 19 2005, John Anthony
>
> Neph. syenite 61.54
> Strontium carb 20.88
> Lithium carb 3.3
> Ball Clay 6.59
> Silica 7.69
>
> add:
> Copper carb 3.5
> Bentonite 4.0
>
> Like: Bright blue green turqoise. However . . .
>
> Dislike: Very rough scratchy matt. No breaking at all on edges. I'd
like
> to retain the color, but change the texture to satin and get it to break
> darker on edges.
> __________________________________________
>
>
> Brad Carter
> Grass Valley, Calif
>
>
____________________________________________________________________________
__
> 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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