F. Parker on thu 20 apr 06
I recently did a test firing with a good many tests. One result is
completely baffling to me. I used the recipe for "Velvety Matte Barium
Cone 6 to 8 Base Glaze" from Rhodes/Hopper "Clay and Glazes for the
Potter" with colorants added. It came out looking like the front side of
a meteorite -- hardly "velvety matte." You can see the results at
http://www.engwrite.com/glaze test 0406/glaze test 0406_1.htm
I fired to cone 6 in oxidation. If anyone has experience with this and
can comment, I'd appreciate it.
Fred Parker
Tae Kim on thu 20 apr 06
that link doesn't seem to work
On 4/20/06, F. Parker wrote:
>
> I recently did a test firing with a good many tests. One result is
> completely baffling to me. I used the recipe for "Velvety Matte Barium
> Cone 6 to 8 Base Glaze" from Rhodes/Hopper "Clay and Glazes for the
> Potter" with colorants added. It came out looking like the front side of
> a meteorite -- hardly "velvety matte." You can see the results at
> http://www.engwrite.com/glaze test 0406/glaze test 0406_1.htm
>
> I fired to cone 6 in oxidation. If anyone has experience with this and
> can comment, I'd appreciate it.
>
> Fred Parker
>
>
> _________________________________________________________________________=
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>
Tae Kim on thu 20 apr 06
anyone know any replacement for barium? it is toxic material, so.....
On 4/20/06, F. Parker wrote:
>
> I recently did a test firing with a good many tests. One result is
> completely baffling to me. I used the recipe for "Velvety Matte Barium
> Cone 6 to 8 Base Glaze" from Rhodes/Hopper "Clay and Glazes for the
> Potter" with colorants added. It came out looking like the front side of
> a meteorite -- hardly "velvety matte." You can see the results at
> http://www.engwrite.com/glaze test 0406/glaze test 0406_1.htm
>
> I fired to cone 6 in oxidation. If anyone has experience with this and
> can comment, I'd appreciate it.
>
> Fred Parker
>
>
> _________________________________________________________________________=
_____
> 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.
>
Maurice Weitman on thu 20 apr 06
At 15:12 -0400 on 4/20/06, F. Parker wrote:
>I recently did a test firing with a good many tests. One result is
>completely baffling to me. I used the recipe for "Velvety Matte Barium
>Cone 6 to 8 Base Glaze" from Rhodes/Hopper "Clay and Glazes for the
>Potter" with colorants added. It came out looking like the front side of
>a meteorite -- hardly "velvety matte." You can see the results at
>http://www.engwrite.com/glaze test 0406/glaze test 0406_1.htm
Fred meant to say:
And folks, don't use spaces/blanks in filenames and directory names
if you're going to put them on the web.
While some browsers will do the right thing when presented with
blanks/spaces, if you want it to work, use hyphens or underscores,
even InterCaps between words. And PLEASE enclose links in brackets
of some kind. I use the angle brackets as above, but I recall
someone saying it might be a problem in the archives.
Best,
Maurice... off to Sunnyvale for the Potter's Council workshop at Momma's Clay.
Daniel Semler on tue 25 apr 06
Hi Fred,
I'm doing some barium glaze tests at the moment.
Got a bunch back last night. All the mattes did better with a bit more
thickness, except one where I'd clearly mixed it a bit thick and the double dip
crawled. Your's look like they could be thin and that the roughness could be the
claybody. You can still see the impression from the canvas that the tile was
worked out on through the glaze.
That said, you said this was a cone 6-8 base and you're at the bottom of that
range, so
it could be a bit stiff for your cone 6.
So I guess try it a bit thicker and if that doesn't do it, loosen it up a bit
and see if that helps. If you want suggestions on that feel free to send me the
recipe and I'll take a look. I tried to find it in my Rhodes but could not.
Perhaps this is one added by Hopper later.
Thanx
D
Daniel Semler on tue 25 apr 06
Hi Tae,
Depends very much on the glaze and the quantity of barium I believe,
as to the degree of success you will have. Barium can have a pronounced effect
on the colour with certain colourants. The classic choices are strontium oxide
(usually from strontium carbonate) or calcium oxide from whiting or
wollastonite.
> anyone know any replacement for barium? it is toxic material, so.....
For what's its worth I have a copper red that I had leach tested for barium
and copper, and it leached very little of either. Some water supplies contain
more barium than that cup leached. It depends on the glaze. Others will
hemorrhage the stuff. Of course that doesn't help with the handling of the raw
material.
Thanx
D
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