Larry Nakanishi on sun 28 aug 11
Reed responded to my question of AJ White. Since I have 3 other white
unknown ingredients, I'll use this test. James let me know about Seattle
Pottery selling AJ White stoneware clay and I may have the dry mix. It
appears that it is the clay, I'll know more on our next firing. If anyone
has similar methods of testing unknown glaze materials, it would be very
helpful.
I was not at the studio where the elements were purchased but I understand
that there were several molds, large pug mill, forklift etc. (maybe in
Vallejo, CA). I am assuming that many of the materials were used for
manufacturing ornaments for yard and fire places using clay and maybe
cement. This would probably explain why we have powdered burnt umber, ochr=
e
yellow, stain 6202 florentine and stain 6600. Will need to study on how to
use these in a glaze.
Thank you for everyone's assistance.
Larry
---------- Forwarded message ----------
From: Reed Bakken
Date: Fri, Aug 26, 2011 at 12:45 PM
Subject: Re: AJ White
To: Larry Nakanishi
**
First put some in your hand and a few drop of water, mix, if it doesn't get
sticky, then
it's not clay. Next put a few drops of vinegar on it, if it bubbles, most
likely it's whiting.
Next mix a glaze that has whiting in it, but use your unknown stuff, fire
and see if it
looks the same as the normal glaze with reg. whiting.
That's what I did. it takes awhile
but then you know for sure. Whiting will feel similar to flint in your hand
if you rub your
hands together.
Reed
----- Original Message -----
*From:* Larry Nakanishi
*To:* Reed Bakken
*Sent:* Friday, August 26, 2011 12:07 PM
*Subject:* Re: AJ White
Hi Reed,
How would I test it for calcium?
Larry
On Fri, Aug 26, 2011 at 7:16 AM, Reed Bakken wrote:
> Hi Larry,
>
> I had the same situation 2 years ago
> and found mine to be Whiting.
>
> Test it for calcium.
>
> Reed form Clay art
>
David Woof on mon 29 aug 11
Hi Larry=3D2C
Good advice from Reed. Also you can Google the suspected ingredient and ge=
=3D
t a description of the physical characteristics. looking at the material un=
=3D
der magnification can reveal the crystaline
structure.=3DA0 Also under a "black light" can be revealing.
If your supplier has a tech on staff usually you can get an answer from a s=
=3D
ample. Reed mentioned firing in a glaze.=3DA0 Fire samples of the material.=
T=3D
his also will give valuable info.
Portland type cement will give a (sickly in my perception) green glaze at c=
=3D
one 9.
David Woof
_________________________________________________
.1. Fwd: AJ White - testing unknown material
Posted by: "Larry Nakanishi" jomi1039@GMAIL.COM=3D20
Date: Sun Aug 28=3D2C 2011 12:42 pm ((PDT))
=3D20
Reed responded to my question of AJ White. Since I have 3 other white
unknown ingredients=3D2C I'll use this test. James let me know about Seatt=
le
Pottery selling AJ White stoneware clay and I may have the dry mix. It
appears that it is the clay=3D2C I'll know more on our next firing. If any=
on=3D
e
has similar methods of testing unknown glaze materials=3D2C it would be ver=
y
helpful.
=3D20
I was not at the studio where the elements were purchased but I understand
that there were several molds=3D2C large pug mill=3D2C forklift etc. (maybe=
in
Vallejo=3D2C CA). I am assuming that many of the materials were used for
manufacturing ornaments for yard and fire places using clay and maybe
cement. This would probably explain why we have powdered burnt umber=3D2C =
oc=3D
hre
yellow=3D2C stain 6202 florentine and stain 6600. Will need to study on ho=
w =3D
to
use these in a glaze.
=3D20
Thank you for everyone's assistance.
Larry
=3D20
---------- Forwarded message ----------
From: Reed Bakken
Date: Fri=3D2C Aug 26=3D2C 2011 at 12:45 PM
Subject: Re: AJ White
To: Larry Nakanishi
=3D20
=3D20
**
First put some in your hand and a few drop of water=3D2C mix=3D2C if it doe=
sn't=3D
get
sticky=3D2C then
it's not clay. Next put a few drops of vinegar on it=3D2C if it bubbles=3D2=
C mo=3D
st
likely it's whiting.
Next mix a glaze that has whiting in it=3D2C but use your unknown stuff=3D2=
C fi=3D
re
and see if it
looks the same as the normal glaze with reg. whiting.
That's what I did. it takes awhile
but then you know for sure. Whiting will feel similar to flint in your hand
if you rub your
hands together.
=3D20
Reed
=3D20
=3DA0=3DA0=3DA0=3D20
=3D
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