Paul Lewing on wed 24 may 00
priddy wrote:
>
> Could you use magnets to get some of the iron out, or have
> I remembered the physics backwards?
I don't think you could, Elisabeth. The iron is a chemical component of
the parent rock, not floating around loose. I think if you put a magnet
in the volcanic ash, either all of it would stick to the magnet or none
of it would. It wouldn't separate the iron from the rest of the ash.
Paul Lewing, Seattle
priddy on wed 24 may 00
Dave Finkelnburg wrote:
Could you use magnets to get some of the iron out, or have
I remembered the physics backwards?
> Mel,
> Ah, simplicity! How wonderful! Volcanic ash can be a great glaze
> ingredient.
> Those who haven't used it need to recognize what those who have use=
d it
> already know -- not all volcanic ashes are alike.
> Mel's Volcanic Ash glaze works with lots of colorants because the i=
ron
> content of the ash is relatively low.
> Mt. St. Helen's ash will produce some different results. It has a
> relatively high iron content, so it isn't as nice with coloring oxides.=
=
For
> those in the U.S., the midwest and New Mexico ash seems to be much lowe=
r in
> iron.
respectfully submitted,
elizabeth priddy
priddy-clay@usa.net
http:www.angelfire.com/nc/clayworkshop
____________________________________________________________________
Get free email and a permanent address at http://www.netaddress.com/?N=3D=
1
Dave Finkelnburg on thu 25 may 00
Hi Elizabeth!
Good question. I have no idea. Never tried it. If the iron were
present as magnetite, a magnet could work. I've seen this work on black
sands. I suspect, though, the iron is a substitution in the crystal lattice
of some of the minerals in the ash, and consequently not magnetic.
Dave Finkelnburg
-----Original Message-----
From: priddy
To: CLAYART@LSV.CERAMICS.ORG
Date: Wednesday, May 24, 2000 7:05 PM
Subject: iron, vol ash, magnets
Dave Finkelnburg wrote:
Could you use magnets to get some of the iron out, or have
I remembered the physics backwards?
> Mel,
> Ah, simplicity! How wonderful! Volcanic ash can be a great glaze
> ingredient.
> Those who haven't used it need to recognize what those who have used
it
> already know -- not all volcanic ashes are alike.
> Mel's Volcanic Ash glaze works with lots of colorants because the iron
> content of the ash is relatively low.
> Mt. St. Helen's ash will produce some different results. It has a
> relatively high iron content, so it isn't as nice with coloring oxides.
For
> those in the U.S., the midwest and New Mexico ash seems to be much lower
in
> iron.
respectfully submitted,
elizabeth priddy
priddy-clay@usa.net
http:www.angelfire.com/nc/clayworkshop
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