Karen Shapiro on sun 19 mar 00
Hi all,
Okay, so only one person answered my last call for
help with setting up this propane system on my raku
kiln ...
I'm working on getting smaller orifices for it, but
here's a new question.
Why wuold my clear raku glaze (70/30 gb/neph.sye)not
smooth out, but rather have an orange-rind texture?
Would that be from reduction? It's not overfiring,
because it never gets smooth before getting bubbly.
I'm getting desperate here -- will have to start
waitressing soon if I can't get this thing firing
right!
thanks,
Karen in Gualala
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Norman van der Sluys on mon 20 mar 00
Perhaps it is underfired. The glaze goes through two bubbly periods - one
before it matures, and one when overfired. If you fire your kiln by sight,
wait until the glaze finishes bubbling and smoothes out before removing the
piece(es).
Norman van der Sluys
Karen Shapiro wrote:
> ----------------------------Original message----------------------------
> Hi all,
>
> Okay, so only one person answered my last call for
> help with setting up this propane system on my raku
> kiln ...
> I'm working on getting smaller orifices for it, but
> here's a new question.
>
> Why wuold my clear raku glaze (70/30 gb/neph.sye)not
> smooth out, but rather have an orange-rind texture?
> Would that be from reduction? It's not overfiring,
> because it never gets smooth before getting bubbly.
>
> I'm getting desperate here -- will have to start
> waitressing soon if I can't get this thing firing
> right!
>
> thanks,
>
> Karen in Gualala
>
> __________________________________________________
> Do You Yahoo!?
> Talk to your friends online with Yahoo! Messenger.
> http://im.yahoo.com
Mike Gordon on mon 20 mar 00
Karen,
I wanted to respond but I couldn't figure out what to say because I
can't figure out what the problem is.Now ..... if you see an orange peel
type surface my guess is that you have too much fuel going in. Try
cutting back on the fuel after reaching temp and make it go into
oxidation and then try cooling it down slow at first, you know? let the
surface smooth out. Let me know, Mike Gordon
Cantello Studios on mon 20 mar 00
It sounds like you may nave your glaze on to thin. It should take about 45
to 55 min. to reach about 1500 and that's where you will see the glaze start
to look like its erupting. after that say 15 min. it should start to glass
out. this is all for the first firing the others will take 15 min. less and
this is all speculation on my part. If your going any faster than that then
your going to fast. If you over fire your glaze it will blister alot.Hope
this helps Chris
-----Original Message-----
From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.UKY.EDU]On Behalf
Of Karen Shapiro
Sent: Sunday, March 19, 2000 8:43 AM
To: CLAYART@LSV.UKY.EDU
Subject: HELP with raku needed...still
----------------------------Original message----------------------------
Hi all,
Okay, so only one person answered my last call for
help with setting up this propane system on my raku
kiln ...
I'm working on getting smaller orifices for it, but
here's a new question.
Why wuold my clear raku glaze (70/30 gb/neph.sye)not
smooth out, but rather have an orange-rind texture?
Would that be from reduction? It's not overfiring,
because it never gets smooth before getting bubbly.
I'm getting desperate here -- will have to start
waitressing soon if I can't get this thing firing
right!
thanks,
Karen in Gualala
__________________________________________________
Do You Yahoo!?
Talk to your friends online with Yahoo! Messenger.
http://im.yahoo.com
Charlie and Linda Riggs on mon 20 mar 00
Karen
My advise it to fire the kiln at night when trying out a new kiln and or
burner. It will allow you to quickly see if you are in oxidation, neutral,
or reduction. Firing too quickly, being in heavy reduction, or heavy
oxidation can boil glazes and some will never smooth back out.
Oxidation is no flame coming out the flue.
Neutral is when you get a little ghost of a flicker now and then.
Reduction is a steady flame coming out the flue.
Heavy reduction is when it looks like you just lit off a rocket.....
After around 1400f it becomes easier adjust the atmosphere in my kiln. If
you put your kiln into heavy reduction and (with some glazes) extreme
oxidation you will end up with less than ideal results. In broad day light
it is really hard to see the flame well enough to "read" the flame and I
have accidentally put the kiln into heavy reduction for almost the whole
firing before. This is a big waste of gas as it can cool off the kiln
almost as fast as it is attempting to heat it up.
I try to keep it in neutral on the way up after 1400f and reduce only when
it if needed for glaze color. The atmosphere is controlled by many thing
that include:
1. Amount of gas/fuel being added.
2.Amount of air/oxygen being allowed in around the burner opening and
through the burner itself.
3.The flue size. Too large and you will have a hard time getting into
neutral or reduction and will " boil" some of your glazes. It will fire in
oxidation all the time and waste fuel. Too small and it will be in
reduction and you will have a hard time reaching temperature and waste gas
and will "boil" some of your glazes.....
If you are wondering if it is a bad batch of glaze and not the kiln then
test it by firing it in your electric kiln. If it looks the same then it's
not your firing technique.
hope this helps
Charlie Riggs
Karen Shapiro wrote:
> ----------------------------Original message----------------------------
> Hi all,
>
> Okay, so only one person answered my last call for
> help with setting up this propane system on my raku
> kiln ...
> I'm working on getting smaller orifices for it, but
> here's a new question.
>
> Why wuold my clear raku glaze (70/30 gb/neph.sye)not
> smooth out, but rather have an orange-rind texture?
> Would that be from reduction? It's not overfiring,
> because it never gets smooth before getting bubbly.
>
> I'm getting desperate here -- will have to start
> waitressing soon if I can't get this thing firing
> right!
>
> thanks,
>
> Karen in Gualala
>
> __________________________________________________
> Do You Yahoo!?
> Talk to your friends online with Yahoo! Messenger.
> http://im.yahoo.com
Michael Banks on mon 20 mar 00
Briefly.. Possible causes of your orange peel texture include;
- glaze immaturity (leave piece in kiln longer, or at higher temp.)
- degassing bisc (fire your bisc higher or longer).
- sulphate contamination of GB (no suggested remedy).
In general don't fire too briefly. Remember that GB is a hydrated mineral
combination and requires some soaking time to finish releasing it's water
vapour.
Michael Banks,
Nelson,
New Zealand
Karen Shapiro wrote:
> ----------------------------Original message----------------------------
> Hi all,
>
> Okay, so only one person answered my last call for
> help with setting up this propane system on my raku
> kiln ...
> I'm working on getting smaller orifices for it, but
> here's a new question.
>
> Why wuold my clear raku glaze (70/30 gb/neph.sye)not
> smooth out, but rather have an orange-rind texture?
> Would that be from reduction? It's not overfiring,
> because it never gets smooth before getting bubbly.
>
> I'm getting desperate here -- will have to start
> waitressing soon if I can't get this thing firing
> right!
Marcia Selsor on tue 21 mar 00
I missed your original post The clear having an Orange peel texture is
peculiar. Is the glaze on too thin? Norman's description sounds right to
me but you yas you didn't get the first bubbling ("pancake ready to
flip stage").
Marcia Selsor in Montana
Norman van der Sluys wrote:
>
> ----------------------------Original message----------------------------
> Perhaps it is underfired. The glaze goes through two bubbly periods - one
> before it matures, and one when overfired. If you fire your kiln by sight,
> wait until the glaze finishes bubbling and smoothes out before removing the
> piece(es).
>
> Norman van der Sluys
>
>
>
> Karen Shapiro wrote:
>
> > ----------------------------Original message----------------------------
> > Hi all,
> >
> > Okay, so only one person answered my last call for
> > help with setting up this propane system on my raku
> > kiln ...
> > I'm working on getting smaller orifices for it, but
> > here's a new question.
> >
> > Why wuold my clear raku glaze (70/30 gb/neph.sye)not
> > smooth out, but rather have an orange-rind texture?
> > Would that be from reduction? It's not overfiring,
> > because it never gets smooth before getting bubbly.
> >
> > I'm getting desperate here -- will have to start
> > waitressing soon if I can't get this thing firing
> > right!
> >
> > thanks,
> >
> > Karen in Gualala
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Talk to your friends online with Yahoo! Messenger.
> > http://im.yahoo.com
--
Marcia Selsor
selsor@imt.net
http://www.imt.net/~mjbmls
http://www.imt.net/~mjbmls/spain99.html
http://www.silverhawk.com/ex99/selsor/welcome.html
aaron tester on tue 21 mar 00
If I may ask, what was the first question of this string?
a.tester
Perhaps it is underfired. The glaze goes through two bubbly periods - one
before it matures, and one when overfired. If you fire your kiln by sight,
wait until the glaze finishes bubbling and smoothes out before removing the
piece(es).
Norman van der Sluys
>From: Norman van der Sluys
>Reply-To: Ceramic Arts Discussion List
>To: CLAYART@LSV.UKY.EDU
>Subject: Re: HELP with raku needed...still
>Date: Mon, 20 Mar 2000 09:05:56 EST
>
>----------------------------Original message----------------------------
>Perhaps it is underfired. The glaze goes through two bubbly periods - one
>before it matures, and one when overfired. If you fire your kiln by sight,
>wait until the glaze finishes bubbling and smoothes out before removing the
>piece(es).
>
>Norman van der Sluys
>
>
>
>Karen Shapiro wrote:
>
> > ----------------------------Original message----------------------------
> > Hi all,
> >
> > Okay, so only one person answered my last call for
> > help with setting up this propane system on my raku
> > kiln ...
> > I'm working on getting smaller orifices for it, but
> > here's a new question.
> >
> > Why wuold my clear raku glaze (70/30 gb/neph.sye)not
> > smooth out, but rather have an orange-rind texture?
> > Would that be from reduction? It's not overfiring,
> > because it never gets smooth before getting bubbly.
> >
> > I'm getting desperate here -- will have to start
> > waitressing soon if I can't get this thing firing
> > right!
> >
> > thanks,
> >
> > Karen in Gualala
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Talk to your friends online with Yahoo! Messenger.
> > http://im.yahoo.com
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
Marvin Flowerman on tue 21 mar 00
Hi Karen:
Saw your desparate message.
Have you contacted Mark Ward at Ward burner systems? He can be very helpful
not only in guiding your procedure, but, if necessary, supplying any part of
the equipment necessary.
He can be reached at:
wardburner@aol.com
or: P.O.Box 333, Dandridge, TN 37725
Hope this helps.
Good luck!
Marvin Flowerman (marvpots@aol.com)
Cantello Studios on tue 21 mar 00
I sometimes use a flashlight to look into the kiln. If its a strong light
you can see the very smallest bubbles finding out just be for it's time to
pull. I discovered this when I started to get big blisters on my large
plates it works well. good luck Chris:)
-----Original Message-----
From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.UKY.EDU]On Behalf
Of Norman van der Sluys
Sent: Monday, March 20, 2000 6:06 AM
To: CLAYART@LSV.UKY.EDU
Subject: Re: HELP with raku needed...still
----------------------------Original message----------------------------
Perhaps it is underfired. The glaze goes through two bubbly periods - one
before it matures, and one when overfired. If you fire your kiln by sight,
wait until the glaze finishes bubbling and smoothes out before removing the
piece(es).
Norman van der Sluys
Karen Shapiro wrote:
> ----------------------------Original message----------------------------
> Hi all,
>
> Okay, so only one person answered my last call for
> help with setting up this propane system on my raku
> kiln ...
> I'm working on getting smaller orifices for it, but
> here's a new question.
>
> Why wuold my clear raku glaze (70/30 gb/neph.sye)not
> smooth out, but rather have an orange-rind texture?
> Would that be from reduction? It's not overfiring,
> because it never gets smooth before getting bubbly.
>
> I'm getting desperate here -- will have to start
> waitressing soon if I can't get this thing firing
> right!
>
> thanks,
>
> Karen in Gualala
>
> __________________________________________________
> Do You Yahoo!?
> Talk to your friends online with Yahoo! Messenger.
> http://im.yahoo.com
Karen Shapiro on wed 22 mar 00
Hi Marcia and all of you who have responded to my
urgent call for help,
Re: the "double bubble" process, I have been using
this glaze as my basic clear for over 2 years, so I
know about this. The glaze never smoothes out, just
goes straight to "overfire acne". I'm convinced now
that the kiln is getting too much gas and have
arranged to get smaller orifices.
Thanks for all the feedback -- as usual, you have been
most helpful. I'll keep you informed on my progress.
Karen in Gualala
__________________________________________________
Do You Yahoo!?
Talk to your friends online with Yahoo! Messenger.
http://im.yahoo.com
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