Lili Krakowski on mon 8 sep 08
Ok. Do me something. Where the raccoons tore a hole into the
wall of my studio, snow got in and soaked a box that Hammill &
Gillespie sent me as a free sample in 1982! (No kidding!) In
doing that the bag in the box disintegrated and the label is
illegible.
The content is a fine white grainy powder that looks a lot like
granulated sugar, and/or very fine grains of frozen snow. It is
kinda sparkly.
I compared it with a bag clearly marked Mica--the Mica is finer
ground, but has some of that sparkly quality.
Can I test--if so how?--if this unidentified stuff is mica? And
if so, what did I get it for? Was it for glaze purposes, or did I
get it way back when I made my own clay bodies?
Yes, there IS a sky-writing plane flying over the house and
spelling out "DUH! "
Why is it so hard for me to follow my own, oft-given, advice?
Lili Krakowski
Be of good courage
John Hesselberth on mon 8 sep 08
On Sep 8, 2008, at 12:50 PM, Lili Krakowski wrote:
> Ok. Do me something. Where the raccoons tore a hole into the
> wall of my studio, snow got in and soaked a box that Hammill &
> Gillespie sent me as a free sample in 1982! (No kidding!) In
> doing that the bag in the box disintegrated and the label is
> illegible.
Hi Lili,
David Hewitt, who died nearly 2 years ago, wrote an extensive article
on identifying unlabeled glaze chemicals. While his web site has now
been taken down, most of it is still available at web.archive.org.
Go to
http://web.archive.org/web/20060428180315/http://www.dhpot.demon.co.uk/
Scroll down the left side navigation bar and you will find the link
under 'Pottery Techniques'. I hope that will give you some clues.
David was a strong contributor to pottery science and it is great
that much of his work is preserved at archive.org.
It, of course, also serves as a reminder that once something is
posted on the web it is likely to be available forever--even after
the person who posts it has taken it down. They archive not only the
latest version of web sites, but nearly every revision.
Regards,
John
John Hesselberth
http://www.frogpondpottery.com
http://www.masteringglazes.com
Cecilia Wian on mon 8 sep 08
If you've had it since 1982 and haven't used it you probably don't
need it and could just dispose of it.
Always an option.
Cecilia
On Mon, Sep 8, 2008 at 12:52 PM, John Hesselberth
wrote:
> On Sep 8, 2008, at 12:50 PM, Lili Krakowski wrote:
>
>> Ok. Do me something. Where the raccoons tore a hole into the
>> wall of my studio, snow got in and soaked a box that Hammill &
>> Gillespie sent me as a free sample in 1982! (No kidding!) In
>> doing that the bag in the box disintegrated and the label is
>> illegible.
Reed Bakken on wed 10 sep 08
Hi Lilli,
The material in question sounds like
it might be Lepidolite.
We have some at school from along
time ago too.
It is a lithium material with silica and sodium,
used to make T.V. picture tubes.
It may work with those barium matt glazes
some like, or as a lithium sub.
Thanks,
Reed Bakken
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