Daniel Semler on wed 20 apr 05
that got redder in oxidation refire.
Hi Craig,
Good point, oops. I should have thought more about what Tichane talks about in
respect of oxidation at the end of copper red firings.
Thanx
D
> Daniel was saying:
> >This sounds like striking-in. Striking-in is used in glass where the
> >colour of the glass after the initial heating and cooling is not red. It is
> >then heated to a lower temperature and held for a while. As a result the
> >copper
> >red colour appears. I've heard that this can be done with copper red glazes.
>
> Hi:
>
> As I recall, Kathy was talking about the glaze becoming redder after a
> refire in the electric. What made the piece redder and brighter was some
> extra oxidation, not achieved in the initial firing.
>
> With respect to strike firing to produce a red, it is necessary to do this
> in reduction so stiking wouldn't apply in this case.
>
> regards, Craig Martell Hopewell, Oregon
>
> ______________________________________________________________________________
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Kathy McDonald on wed 20 apr 05
that got redder in oxidation refire.
Yes, the glaze became almost a red/maroon color after the
oxidation refire to c 02.
This is a new to me. I expected in to refire to a copper green color
which has happened in the past when I put c 10R copper glazes in an
oxidation refire
to c 6 or 9.
Kathy
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG]On Behalf Of Craig Martell
Sent: Wednesday, April 20, 2005 10:10 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Questions for the glaze gurus:Crazing:Refires :Copper reds that
got redder in oxidation refire.
Daniel was saying:
>This sounds like striking-in. Striking-in is used in glass where the
>colour of the glass after the initial heating and cooling is not red. It is
>then heated to a lower temperature and held for a while. As a result the
>copper
>red colour appears. I've heard that this can be done with copper red
glazes.
Hi:
As I recall, Kathy was talking about the glaze becoming redder after a
refire in the electric. What made the piece redder and brighter was some
extra oxidation, not achieved in the initial firing.
With respect to strike firing to produce a red, it is necessary to do this
in reduction so stiking wouldn't apply in this case.
regards, Craig Martell Hopewell, Oregon
____________________________________________________________________________
__
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
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melpots@pclink.com.
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Ron Roy on sat 23 apr 05
that got redder in oxidation refire.
I agree with Daniel in this - refiring allows the crystals that are
necessary for the coluor to develope.
I don't know what would happen if the striking was done in reduction - but
I do know it works in oxidation for both copper reds and chrome tin reds -
because they both depend on crystal developement.
Changes also happens in Shino glazes - more red after a bisue firing -
again because there is more crystalization.
When refired to promote changes the crystals get a chance to grow on the
way up and on the way down - as opposed to slowing down the cooling in the
original firing where the crystals only get a chance to grow on the way
down - in that situation you would need to slow down a lot longer to get
the same results.
RR
>Daniel was saying:
>>This sounds like striking-in. Striking-in is used in glass where the
>>colour of the glass after the initial heating and cooling is not red. It is
>>then heated to a lower temperature and held for a while. As a result the
>>copper
>>red colour appears. I've heard that this can be done with copper red glazes.
>
>Hi:
>
>As I recall, Kathy was talking about the glaze becoming redder after a
>refire in the electric. What made the piece redder and brighter was some
>extra oxidation, not achieved in the initial firing.
>
>With respect to strike firing to produce a red, it is necessary to do this
>in reduction so stiking wouldn't apply in this case.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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