jennifer reilly on sat 12 apr 97
>From: jennifer reilly
>
>I have several purple galzes that turned green instead of purple. Any one
know what my problem is?
>
>example:
>
>Lilac matt
>^6
>
>Felspar soda 20.00
>nepheline syenite 25.00
>epk 23
>whiting 32
>tin oxide 5
>cobalt carb 0.2
>chrome oxide 0.2
>
>
>Also would G-200 sub for custer felspar have a colour change???
>
>jenn
>
PJLewing@aol.com on sun 13 apr 97
I wouln't ever expect a recipe with equal parts cobalt and chrome to be
anything but green. Well, OK, maybe blue-brown in a zinc base.
Paul Lewing, Seattle
Rick Sherman on sun 13 apr 97
---------------------Original Message---------------------
From: jennifer reilly
>
>I have several purple galzes that turned green instead of purple. Any one know
>
>example: Lilac mat ^6
>
>Felspar soda 20.00
>nepheline syenite 25.00
>epk 23
>whiting 32
>tin oxide 5
>cobalt carb 0.2
>chrome oxide 0.2
>
>Also would G-200 sub for custer felspar have a colour change???
>
jenn
-----------------------------
Jenn: Your formula calls for a SODA feldspar and you are using Custer
and thinking of substituting G-200. These are both POTASH feldspars.
Pehaps you should try a soda spar such as Kona F-4. Perhaps some
other clayarters will have ideas. RS
>
Sherry mcDonald Stewart on tue 15 apr 97
I have gotten in on this late, but all this on purple glazes reminds me
of the barium lithium glaze I experimented with many years ago. I don't
have my records at hand, but if you are using such a barium, lithium
glaze, I can tell you that your color can range terrifically! And can be
controlled! Water content is very important, thickness of glaze,
temperature fired to (the range is very wide) I got the best purple from
low firings in oxidation.I got a lot of turquoise, and cobalt blue, it
was drier at lower temps. In post reduction, I achieved a wonderful mold
color and a rust, on the same pieces. I experimented with this glaze for
years and was facinated with it. The work I made with this glaze got
into at least every other show I entered, and I have just recently seen
some pieces showing up in ceramics monthly, and this is years later.
When mine was published in ceramics monthly, and American craft, it was
in black and white. (go figure that) The beauty of this glaze is the
color variety, as well as texture. On porcelain at ^6 it is smooth and
purple with cobalt and turquoise in thin areas (rims, etc.) This glaze
has a , "sister glaze" that produces mostly a greener turquoise. Maybe I
have been some help...?
Jeanne Ormsby on wed 16 apr 97
Sherry--do you remember the firing range that you used? At what point did it
change colors?
Jeanne
At 07:07 AM 4/15/97 EDT, you wrote:
>----------------------------Original message----------------------------
>I have gotten in on this late, but all this on purple glazes reminds me
>of the barium lithium glaze I experimented with many years ago. I don't
>have my records at hand, but if you are using such a barium, lithium
>glaze, I can tell you that your color can range terrifically! And can be
>controlled! Water content is very important, thickness of glaze,
>temperature fired to (the range is very wide) I got the best purple from
>low firings in oxidation.I got a lot of turquoise, and cobalt blue, it
>was drier at lower temps. In post reduction, I achieved a wonderful mold
>color and a rust, on the same pieces. I experimented with this glaze for
>years and was facinated with it. The work I made with this glaze got
>into at least every other show I entered, and I have just recently seen
>some pieces showing up in ceramics monthly, and this is years later.
>When mine was published in ceramics monthly, and American craft, it was
>in black and white. (go figure that) The beauty of this glaze is the
>color variety, as well as texture. On porcelain at ^6 it is smooth and
>purple with cobalt and turquoise in thin areas (rims, etc.) This glaze
>has a , "sister glaze" that produces mostly a greener turquoise. Maybe I
>have been some help...?
>
>
Sherry mcDonald Stewart on wed 16 apr 97
I have been receiving messages. People wanting this glaze formula. I
don't have it, it's in storage in a far off state! It is not a secret
glaze, however, it is in at least one of the major glaze books, and
would not be hard to find. The success with this glaze does not come
from following the formula, but from your own experimentation with it,
Highly rewarding. If I get my hands on it, I will put it on the list,
until then, search the glaze books for barium lithium glazes.
Sherry mcDonald Stewart on thu 17 apr 97
I fired this glaze fron ^05 to ^6 oxidation, at each increment in
temperature there are changes in color and texture. In raku, the glaze
changed depending upon the material I used to reduce in, and the time
reduced. You will have to play with it. You will have fun, you will be
intrigued, you will fall in love, you will emerge..even if NCECA doesn't
know it!
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