Peter Atwood on wed 31 mar 99
Folks,
Here's a quick and easy way to do a thorough line blend test of two
glazes. Over the weekend we hosted a glaze workshop with Angela Fina,
Glaze Maven of the East. This is one of the tests that she gave us to
try.
The line blend of two glazes is as follows:
Dry mix 100 grams of each of the two glazes. Put them into clear plastic
cups and add water to each until the level in each cup is equal. Label
"Glaze A" and "Glaze B". She says that if one is thicker in consistency
than the other that it doesn't matter. The important thing is to have
two cups with the identical amount VOLUME-wise in each one. This is a
percentage test that relies completely on volume to be accurate so make
sure those cups are the same.
Next, put out nine plastic cups and label them 10 glaze A /90 glaze B,
20 glaze A /80 glaze B, etc. You will have nine total.
Now, you will need a large syringe without the needle. She got hers from
her vet. Suck up 2 cc of glaze A and put it into the first cup. (You
will need to tap the syringe to dislodge air bubbles and purge them just
like in the doctor's office before adding to the cups.) Put 4 cc in the
next cup and 6 in the next. And so on until the last cup which will get
18cc. Clean the syringe and go to Glaze B. Draw 18cc and add to the
first cup to make 20cc of volume. Add 16cc to the next and so on down
the line.
All cups will have 20cc except the parent cups which will have almost
nothing left in them. This is pretty quick and easy once you get going
and allows you to do much more than simple overlaps. Angela says that
she has gotten some of her best glazes this way. I don't know how to
figure out the percentages at the end if you do find a combination that
you like, but I'm sure it can be done.
She paints the samples onto tiles doing four stripes with 4,3,2 and 1
coats on the stripes to show different thicknesses. For sometimes
dramatic results she recommended doing this test with two quite
dissimilar glazes.
The tests that I'm doing will go into the kiln tonight so by Friday I
should have something interesting.
--Peter Atwood
Get Your Private, Free Email at http://www.hotmail.com
Stanley Irvin on fri 2 apr 99
Pete,
I have been asked to do a one week glaze workshop this summer and read
with interest your comments about your workshop with Angela Fina. I would
like to contact her and perhaps pick her brain for ideas on specific
assignments she has her students do in these workshops. Could you tell me
how to get in touch with Angela and or perhaps elaborate on what you
did in the class. My e-mail address is stanleyi@admin.stedwards.edu if
wish to contact me directly. Thank you for any help you can provide.
Stan >
> ----------------------------Original message----------------------------
> Folks,
>
> Here's a quick and easy way to do a thorough line blend test of two
> glazes. Over the weekend we hosted a glaze workshop with Angela Fina,
> Glaze Maven of the East. This is one of the tests that she gave us to
> try.
>
> The line blend of two glazes is as follows:
>
> Dry mix 100 grams of each of the two glazes. Put them into clear plastic
> cups and add water to each until the level in each cup is equal. Label
> "Glaze A" and "Glaze B". She says that if one is thicker in consistency
> than the other that it doesn't matter. The important thing is to have
> two cups with the identical amount VOLUME-wise in each one. This is a
> percentage test that relies completely on volume to be accurate so make
> sure those cups are the same.
>
> Next, put out nine plastic cups and label them 10 glaze A /90 glaze B,
> 20 glaze A /80 glaze B, etc. You will have nine total.
>
> Now, you will need a large syringe without the needle. She got hers from
> her vet. Suck up 2 cc of glaze A and put it into the first cup. (You
> will need to tap the syringe to dislodge air bubbles and purge them just
> like in the doctor's office before adding to the cups.) Put 4 cc in the
> next cup and 6 in the next. And so on until the last cup which will get
> 18cc. Clean the syringe and go to Glaze B. Draw 18cc and add to the
> first cup to make 20cc of volume. Add 16cc to the next and so on down
> the line.
>
> All cups will have 20cc except the parent cups which will have almost
> nothing left in them. This is pretty quick and easy once you get going
> and allows you to do much more than simple overlaps. Angela says that
> she has gotten some of her best glazes this way. I don't know how to
> figure out the percentages at the end if you do find a combination that
> you like, but I'm sure it can be done.
>
> She paints the samples onto tiles doing four stripes with 4,3,2 and 1
> coats on the stripes to show different thicknesses. For sometimes
> dramatic results she recommended doing this test with two quite
> dissimilar glazes.
>
> The tests that I'm doing will go into the kiln tonight so by Friday I
> should have something interesting.
>
> --Peter Atwood
> Get Your Private, Free Email at http://www.hotmail.com
>
L Ewing on sat 3 apr 99
Hi everyone,
For those interested in volumetric blending techniques using a syringe you =
may
like to take a look at Matrix Glaze Calculation Software. Matrix will =
generate
in a few minutes all the data you need to create line, triaxial and =
quadraxial
(biaxial) blends using this technique. The process simply involves entering=
the
'corner' glazes (e.g. the first and last glaze for line blends) then =
clicking a
few buttons to tell Matrix what kind =26 size blend you wish to create and =
all the
calculations are done for you. Matrix produces a worksheet with a batch =
recipe
for the corner glazes, all of the proportions needed for each sample and a =
list
of all the recipes which are generated in the blend. Another printout will =
give
you the unity formula for each recipe in the blend.
You can look at this and all of the other features which Matrix offers by =
going
to the following web site:
http://www.tekotago.ac.nz/art/matrixgoweb/default.htm
A free demo of Matrix for Windows PCs can now be downloaded from this site.
Lawrence Ewing
Senior Lecturer in Ceramics
School of Art
Otago Polytechnic
lewing=40clear.net.nz
21 Slant St
Careys Bay
Dunedin
NEW ZEALAND
ph 03 472 8801
Author of Matrix Glaze Calculation Software for Macintosh =26 Windows95
-----Original Message-----
From: Peter Atwood =5BSMTP:fountainman=40hotmail.com=5D
Sent: Thursday, April 01, 1999 7:01 AM
To: CLAYART=40LSV.UKY.EDU
Subject: line blend for two glazes
----------------------------Original message----------------------------
Folks,
Here's a quick and easy way to do a thorough line blend test of two
glazes. Over the weekend we hosted a glaze workshop with Angela Fina,
Glaze Maven of the East. This is one of the tests that she gave us to
try.
The line blend of two glazes is as follows:
Dry mix 100 grams of each of the two glazes. Put them into clear plastic
cups and add water to each until the level in each cup is equal. Label
=22Glaze A=22 and =22Glaze B=22. She says that if one is thicker in =
consistency
than the other that it doesn't matter. The important thing is to have
two cups with the identical amount VOLUME-wise in each one. This is a
percentage test that relies completely on volume to be accurate so make
sure those cups are the same.
Next, put out nine plastic cups and label them 10 glaze A /90 glaze B,
20 glaze A /80 glaze B, etc. You will have nine total.
Now, you will need a large syringe without the needle. She got hers from
her vet. Suck up 2 cc of glaze A and put it into the first cup. (You
will need to tap the syringe to dislodge air bubbles and purge them just
like in the doctor's office before adding to the cups.) Put 4 cc in the
next cup and 6 in the next. And so on until the last cup which will get
18cc. Clean the syringe and go to Glaze B. Draw 18cc and add to the
first cup to make 20cc of volume. Add 16cc to the next and so on down
the line.
All cups will have 20cc except the parent cups which will have almost
nothing left in them. This is pretty quick and easy once you get going
and allows you to do much more than simple overlaps. Angela says that
she has gotten some of her best glazes this way. I don't know how to
figure out the percentages at the end if you do find a combination that
you like, but I'm sure it can be done.
She paints the samples onto tiles doing four stripes with 4,3,2 and 1
coats on the stripes to show different thicknesses. For sometimes
dramatic results she recommended doing this test with two quite
dissimilar glazes.
The tests that I'm doing will go into the kiln tonight so by Friday I
should have something interesting.
--Peter Atwood
Get Your Private, Free Email at http://www.hotmail.com
David Hewitt on tue 6 apr 99
I can confirm the ease with which MATRIX can carry out the blending
exercise. It is also a very easy program to use for straight forward
analysis and creating recipes from an analysis.
Also a recent addition to MATRIX enables a glaze to be analysed into %
Mol Parts,- Basic, Amphoteric and Acidic - and to see these plotted on a
triaxial Phase Equilibrium Diagram together with the eutectic lines for
the main oxides. As far as I know this is the only Glaze Program that
can do this.
Those of you who recently followed the thread on colouring oxides
reducing crazing and the use of Appen's coefficients for colouring
oxides, may also be interested to know that Matrix includes Appen's
figures and that you can switch from one set of coefficients at will to
suit your inclinations on these coefficients.
David
In message , L Ewing writes
>----------------------------Original message----------------------------
>Hi everyone,
>
>For those interested in volumetric blending techniques using a syringe you =
>may
>like to take a look at Matrix Glaze Calculation Software. Matrix will =
>generate
>in a few minutes all the data you need to create line, triaxial and =
>quadraxial
>(biaxial) blends using this technique. The process simply involves entering=
> the
>'corner' glazes (e.g. the first and last glaze for line blends) then =
>clicking a
>few buttons to tell Matrix what kind =26 size blend you wish to create and =
>all the
>calculations are done for you. Matrix produces a worksheet with a batch =
>recipe
>for the corner glazes, all of the proportions needed for each sample and a =
>list
>of all the recipes which are generated in the blend. Another printout will =
>give
>you the unity formula for each recipe in the blend.
>
>You can look at this and all of the other features which Matrix offers by =
>going
>to the following web site:
>
>http://www.tekotago.ac.nz/art/matrixgoweb/default.htm
>
>A free demo of Matrix for Windows PCs can now be downloaded from this site.
>
>Lawrence Ewing
>
>Senior Lecturer in Ceramics
>School of Art
>Otago Polytechnic
>
>lewing=40clear.net.nz
>
>21 Slant St
>Careys Bay
>Dunedin
>NEW ZEALAND
>
>ph 03 472 8801
>
>Author of Matrix Glaze Calculation Software for Macintosh =26 Windows95
>
--
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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