Ron Roy on thu 3 jan 08
Some one is asking me - Is there color when iron oxide is disolved in an
otherwise glossy, clear, supercooled glaze matrix ; as part of the glass
network rather than as separate crystals. If there is color would the glaze
be glossy transparent or glossy translucent?
Anyone have any thoughts on this?
RR
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Lynne and Bruce Girrell on thu 3 jan 08
Ron Roy wrote:
> Is there color when iron oxide is disolved in an
> otherwise glossy, clear, supercooled glaze matrix ; as part of the glass
> network rather than as separate crystals. If there is color would the
> glaze
> be glossy transparent or glossy translucent?
Celadon?
And wouldn't plate glass fall into this category? Look at plate glass from
the edge and you can see how green it is - due to iron content.
Bruce Girrell
Timothy Joko-Veltman on thu 3 jan 08
Isn't one of the features of a solution that you cannot visually
distinguish between the solute and solvent? So it seems to me that
the glaze you describe could be transparent, opaque, and possibly
translucent as well, depending on the quantity of iron dissolved in
the glaze.
I suspect that many celadons and amber glazes are examples of this
kind of glaze.
Cheers,
Tim
On Jan 3, 2008 5:12 AM, Ron Roy wrote:
> Some one is asking me - Is there color when iron oxide is disolved in an
> otherwise glossy, clear, supercooled glaze matrix ; as part of the glass
> network rather than as separate crystals. If there is color would the glaze
> be glossy transparent or glossy translucent?
>
> Anyone have any thoughts on this?
>
> RR
>
> Ron Roy
> RR#4
> 15084 Little Lake Road
> Brighton, Ontario
> Canada
> K0K 1H0
>
> ______________________________________________________________________________
> Clayart members may send postings to: clayart@lsv.ceramics.org
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>
Michael Wendt on sat 5 jan 08
Ron,
I read an article in Scientific
American titled:
"The Quest for the Super Lens"
by Pendry and Smith
July 2006.
It explains in detail how light
reacts to atomic structures
both in the electrical and in
the magnetic realm. From this
I would claim that metals fully
suspended in a glassy matrix
would still exhibit optical
properties consistent with
their electron shell structures
and the related electromagnetic
fields they generate.
Color comes from these properties.
Regards,
Michael Wendt
Wendt Pottery
2729 Clearwater Ave.
Lewiston, Id 83501
U.S.A.
208-746-3724
wendtpot@lewiston.com
http://www.wendtpottery.com
http://UniquePorcelainDesigns.com
Ivor and Olive Lewis on sun 6 jan 08
Dear Michael Wendt,=20
Interesting proposition << It explains in detail how light reacts to =
atomic structures both in the electrical and in the magnetic realm. From =
this I would claim that metals fully suspended in a glassy matrix would =
still exhibit optical properties consistent with their electron shell =
structures
and the related electromagnetic fields they generate. Color comes from =
these properties.>>
I would like to read this so a request will be placed then next time the =
Library drives into the township.
So, is this about the behaviour of Photons and their interaction with =
atoms of elements in their ionised state ? Are you implying that Iron =
and Oxygen are separated from each other ?
Best regards,
Ivor Lewis.
Redhill,
South Australia.
WILLIAM JAMES on mon 7 jan 08
hi ya'll
=20
i would think temp. would have a big roll in all that too being super coole=
d. ?
> Date: Sun, 6 Jan 2008 16:42:44 +1030> From: iandol@WESTNET.COM.AU> Subjec=
t: Re: Iron in glazes???> To: CLAYART@LSV.CERAMICS.ORG> > Dear Michael Wend=
t, > > Interesting proposition << It explains in detail how light reacts to=
atomic structures both in the electrical and in the magnetic realm. From t=
his I would claim that metals fully suspended in a glassy matrix would stil=
l exhibit optical properties consistent with their electron shell structure=
s> and the related electromagnetic fields they generate. Color comes from t=
hese properties.>>> > I would like to read this so a request will be placed=
then next time the Library drives into the township.> > So, is this about =
the behaviour of Photons and their interaction with atoms of elements in th=
eir ionised state ? Are you implying that Iron and Oxygen are separated fro=
m each other ?> > Best regards,> > Ivor Lewis.> Redhill,> South Australia.>=
> ________________________________________________________________________=
______> Clayart members may send postings to: clayart@lsv.ceramics.org> > Y=
ou may look at the archives for the list, post messages, or change your> su=
bscription settings here: http://www.acers.org/cic/clayart/> > Moderator of=
the list is Mel Jacobson who may be reached at melpots2@visi.com=
Sabri Justin Douglas Ben-Achour on tue 8 jan 08
The colors of Iron oxides are the result of the energy of the Iron and Oxyg=
en bond. The bond between the two can get stretched or compressed, and can=
have different energies depending on the charge of iron, and what else the=
iron or oxygen might be attached to, and what else is in the glaze, and th=
e temperature, and the shape/coordination of the iron molecule.
Here are the forms of Iron in glazes and their colors.
Fe2+ dissolved in glass =3D greenish
Fe2+ out of glaze (or crystallized out of it) =3D Black/Dark Brown
Fe3+ (as crystals or microscopic pockets in the glaze) =3D red/orange
What form Iron takes depends on the type of firing (oxidation or reduction)=
and the ingredients of the glaze and their concentrations. =20
Sometimes, Iron can take the Fe2+ form at high temperature and then change =
back to Fe3+ when it's cooled slowly and you get orange. Othertimes, it wo=
n't have time to switch back to Fe3+ and will be 'frozen' as Fe2+ if it's c=
ooled too fast, and you get blacker color. =20
This article has a lot to say on Iron in clay minerals. Not quite glasses =
but still useful.
http://adsabs.harvard.edu/abs/2003TrGeo...7..309V
sabri
www.thesabritree.com
>
> Date: Mon, 7 Jan 2008 18:50:52 +0000
> From: WILLIAM JAMES=20
> Subject: Re: Iron in glazes???
>
> hi ya'll
> =3D20
> i would think temp. would have a big roll in all that too being super coo=
le=3D
> d. ?
>
>
>
>> Date: Sun, 6 Jan 2008 16:42:44 +1030> From: iandol@WESTNET.COM.AU> Subje=
c=3D
> t: Re: Iron in glazes???> To: CLAYART@LSV.CERAMICS.ORG>> Dear Michael Wen=
d=3D
> t,>> Interesting proposition << It explains in detail how light reacts to=
=3D
> atomic structures both in the electrical and in the magnetic realm. From =
t=3D
> his I would claim that metals fully suspended in a glassy matrix would st=
il=3D
> l exhibit optical properties consistent with their electron shell structu=
re=3D
> s> and the related electromagnetic fields they generate. Color comes from=
t=3D
> hese properties.>>>> I would like to read this so a request will be place=
d=3D
> then next time the Library drives into the township.>> So, is this about =
=3D
> the behaviour of Photons and their interaction with atoms of elements in =
th=3D
> eir ionised state ? Are you implying that Iron and Oxygen are separated f=
ro=3D
> m each other ?>> Best regards,>> Ivor Lewis.> Redhill,> South Australia.>=
=3D
>> ________________________________________________________________________=
=3D
> ______> Clayart members may send postings to: clayart@lsv.ceramics.org>> =
Y=3D
> ou may look at the archives for the list, post messages, or change your> =
su=3D
> bscription settings here: http://www.acers.org/cic/clayart/>> Moderator o=
f=3D
> the list is Mel Jacobson who may be reached at melpots2@visi.com=3D
>
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