Donna Kat on sun 21 oct 07
I have two buckets of Spodumene. One is bright white, the other dull
gray. Can anyone give me additional information on this? I know that
spodumene changed a while back in the U.S. but I do not know anything
beyond that. I'm worried about messing up a good glaze and I can't
remember which I used previously. Donna
Dan Semler on mon 22 oct 07
Hi Donna,
If the bright white one sparkles in sunlight it likely Aussie spod.
The other I assume is Tanko or something like that, assuming its not
talc.
Thx
D
Hank Murrow on mon 22 oct 07
On Oct 21, 2007, at 2:58 PM, Donna Kat wrote:
> I have two buckets of Spodumene. One is bright white, the other dull
> gray. Can anyone give me additional information on this? I know that
> spodumene changed a while back in the U.S. but I do not know anything
> beyond that. I'm worried about messing up a good glaze and I can't
> remember which I used previously. Donna
Dear Donna;
Why don't you take a thimble and pack it with a sample of each
material and carefully tip the samples onto a piece of bisque and
fire them to your glaze temperature? You will likely see a difference
and can proceed as need dictates then.
Cheers, Hank
www.murrow.biz/hank
threereeds1 on mon 22 oct 07
Donna,
I would gladly trade my new Australian white shiny for your old powdery
gray.
Needs to be enough to make it worthwhile. smiles.
Best,
Tom King
----- Original Message -----
From: "Donna Kat"
To:
Sent: Sunday, October 21, 2007 4:58 PM
Subject: Spodumene help
>I have two buckets of Spodumene. One is bright white, the other dull
> gray. Can anyone give me additional information on this? I know that
> spodumene changed a while back in the U.S. but I do not know anything
> beyond that. I'm worried about messing up a good glaze and I can't
> remember which I used previously. Donna
>
> ______________________________________________________________________________
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>
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>
Bill Merrill on mon 22 oct 07
Hank,
One spodumene may be low iron and the other have iron in it. Make a
fusion button of each of them. One may expand 2-3 times and be orange
after firing to c/9-10. The other may be white and not expand as much.
I still use the Foote mineral spodimene which I can't find anymore. I
always liked the oranger of the two especially in "shino" glazes.
Bill Merrrill billm@pcadmin.ctc.edu
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Hank Murrow
Sent: Monday, October 22, 2007 9:22 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Spodumene help
On Oct 21, 2007, at 2:58 PM, Donna Kat wrote:
> I have two buckets of Spodumene. One is bright white, the other dull
> gray. Can anyone give me additional information on this? I know that
> spodumene changed a while back in the U.S. but I do not know anything
> beyond that. I'm worried about messing up a good glaze and I can't
> remember which I used previously. Donna
Dear Donna;
Why don't you take a thimble and pack it with a sample of each
material and carefully tip the samples onto a piece of bisque and
fire them to your glaze temperature? You will likely see a difference
and can proceed as need dictates then.
Cheers, Hank
www.murrow.biz/hank
________________________________________________________________________
______
Clayart members may send postings to: clayart@lsv.ceramics.org
You may look at the archives for the list, post messages, or change your
subscription settings here: http://www.acers.org/cic/clayart/
Moderator of the list is Mel Jacobson who may be reached at
melpots2@visi.com
Hank Murrow on mon 22 oct 07
On Oct 22, 2007, at 1:06 PM, Bill Merrill wrote:
> Hank,
>
> One spodumene may be low iron and the other have iron in it. Make a
> fusion button of each of them. One may expand 2-3 times and be orange
> after firing to c/9-10. The other may be white and not expand as
> much.
> I still use the Foote mineral spodimene which I can't find anymore. I
> always liked the oranger of the two especially in "shino" glazes.
Dear Bill;
Though it was not me that asked about the two Spodumene's, the
'thimble test'(fusion button) is almost as good as the 'assay cup'
test which I use to help identify materials and the differences
between them. I went through my supplies of "Spodumene" some years
ago and found that I had three kinds... light, medium, and dark; so I
separated them into three barrels for use as occasion and glaze and
clay suggested. For example, I use the TANCO Low Melt Spodumene for
my Shinos because the phosphorus content gives richer reds........
some are actually bloody. I use the 'dirty' Foote Spodumene(old
stock) for a couple of glazes that 'need' the slight contamination to
become lively. I have several 'bags' of Foote....... enough to last
me the remaining (possible) 20 years of working. can't ever think of
moving this studio now!
Cheers! Hank
www.murrow.biz/hank
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