Lili Krakowski on sun 11 jul 10
Use it is a glaze test. Brush some cobalt, also some chrome on the =3D
test.
If it is whiting, the cobalt should be a nice blue, the chrome a yucky =3D
but identifiable green.
If it is dolomite the magnesium in the dolomite will turn the cobalt a =3D
purplish blue,ultramarine rather than cobalt, the chrome a yucky green/
If it is zinc the cobalt will give a very "pure" blue and the chrome a =3D
truly nasty brown.
In any case use the chrome lightly...
If it is lithium the glaze probably will overflux in relation to what it =
=3D
is supposed to do, but the blue should be nice.
If it is bone ash...well, results should be identical or close to =3D
whiting.
If it is cryolite should flux a bit less than whiting, and or =3D
fluorspar...duh...should give a nicer blue.
For talc, see dolomite.
For strontium see lithium.
I have never seen a bag of some white stuff marked simply #1.
I wish you well.
Lili Krakowski
Be of good courage
Frank Gaydos on sun 11 jul 10
Could it be #1 pottery plaster?=3D20
----- Original Message -----=3D20
From: "Lili Krakowski" =3D20
To: Clayart@LSV.CERAMICS.ORG=3D20
Sent: Sunday, July 11, 2010 1:05:19 AM=3D20
Subject: #1 white--what is it...=3D20
Use it is a glaze test. =3DC2=3DA0Brush some cobalt, also some chrome on th=
e te=3D
st.=3D20
If it is whiting, the cobalt should be a nice blue, the chrome a yucky but =
=3D
identifiable green.=3D20
If it is dolomite the magnesium in the dolomite will turn the cobalt a purp=
=3D
lish blue,ultramarine rather than cobalt, the chrome a yucky green/=3D20
If it is zinc the cobalt will give a very "pure" blue and the chrome a trul=
=3D
y nasty brown.=3D20
In any case use the chrome lightly...=3D20
If it is lithium the glaze probably will overflux in relation to what it is=
=3D
supposed to do, but the blue should be nice.=3D20
If it is bone ash...well, results should be identical or close to whiting.=
=3D
=3D20
If it is cryolite should =3DC2=3DA0flux a bit less than whiting, and or flu=
orsp=3D
ar...duh...should give a nicer blue.=3D20
For talc, see dolomite.=3D20
For strontium see lithium.=3D20
I have never seen a bag of some white stuff marked simply #1.=3D20
I wish you well.=3D20
Lili Krakowski=3D20
Be of good courage=3D20
Lili Krakowski on sun 11 jul 10
Hi, Frank!
I did not consider plaster because I assumed this forgotten, neglected, =3D
orphan bag of white powder would have become a bag of white lumps if it =3D
were plaster. However, there are better climates than C'ville's, so =3D
plaster it may be.
----- Original Message -----=3D20
From: Frank Gaydos=3D20
To: Lili Krakowski=3D20
Cc: Clayart@LSV.CERAMICS.ORG=3D20
Sent: Sunday, July 11, 2010 1:40 PM
Subject: Re: #1 white--what is it...
Could it be #1 pottery plaster?
----- Original Message -----
From: "Lili Krakowski"
To: Clayart@LSV.CERAMICS.ORG
Sent: Sunday, July 11, 2010 1:05:19 AM
Subject: #1 white--what is it...
Use it is a glaze test. Brush some cobalt, also some chrome on the =3D
test.
If it is whiting, the cobalt should be a nice blue, the chrome a yucky =
=3D
but identifiable green.
If it is dolomite the magnesium in the dolomite will turn the cobalt a =
=3D
purplish blue,ultramarine rather than cobalt, the chrome a yucky green/
If it is zinc the cobalt will give a very "pure" blue and the chrome a =
=3D
truly nasty brown.
In any case use the chrome lightly...
If it is lithium the glaze probably will overflux in relation to what =3D
it is supposed to do, but the blue should be nice.
If it is bone ash...well, results should be identical or close to =3D
whiting.
If it is cryolite should flux a bit less than whiting, and or =3D
fluorspar...duh...should give a nicer blue.
For talc, see dolomite.
For strontium see lithium.
I have never seen a bag of some white stuff marked simply #1.
I wish you well.
Lili Krakowski
Be of good courage
-------------------------------------------------------------------------=
=3D
-----
No virus found in this incoming message.
Checked by AVG - www.avg.com=3D20
Version: 9.0.830 / Virus Database: 271.1.1/2993 - Release Date: =3D
07/10/10 02:36:00
Reed Bakken on mon 12 jul 10
Just an update on this, and thanks
for all the ideas.
I was hoping for a quick solution,
guess it won't be that easy.
This came to me from a high school which
is getting rid of all there raw stuff, going to
pre-mixed glazes and clay. Some of this has
sat around for 40 or 50 years so I was thinking
some old potter might know.
Not plaster, most likely whiting, I did the
vinegar test and got bubbles, a carbonate of
some sort.
I will be putting it in the bisque this week to compare
it to the whiting I have.
Lili, your ideas are spot on, I was looking
for a quick find, but may have to go with all
that testing. We'll see soon.
Thank to all again,
Reed
P.S. I also have some frits that are
not listed anywhere I can find. I did get
a 50 lb. bag of lithium carb., pays for all
this work!
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