Mike Gordon on mon 19 jan 04
Laurie,
There is a opalescent liquid you can apply to a cone 6 white glaze and
refire it at c/018 I think. It's TOXIC as hell, apply it outside & be
upwind, Mike Gordon
On Jan 19, 2004, at 10:06 AM, Laurie Kneppel wrote:
> Hi, I have a glaze question that is probably simple, but I haven't
> really been able to find much info on my own. Maybe I am not looking in
> the right places or calling it the right name.
>
> When I was in college many years ago we had a glaze that would produce
> little bluish white opalescent splotches here and there where it was
> applied thick and dripped. I can't remember the name for anything, but
> all the glazes were cone 10 reduction fired. I would love to find out
> what sort of glaze produces this effect and how to get it on a
> consistent basis. I still have a little 25 year old lidded jar glazed
> with Honey Luster with splotches of that mystery glaze on it producing
> little bluish white accents.
>
> Also is it possible to get this effect with a cone 6 reduction or
> oxidation glaze?
>
> Thanks!
>
> Laurie
> Sacramento, CA
>
> _______________________________________________________________________
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Krista Peterson on mon 19 jan 04
>Also is it possible to get this effect with a cone 6 reduction or
>oxidation glaze?
I'm having a hard time visualizing what you mean with the blueish white opalescent, BUT,
it reminds me of some of the tests I did in college. I was experimenting with cone 5/6 oxidation
and barium glazes. Although I think I ended up using strontium carb instead of that most of the time.
Anyways, I was also using Pearl Ash and was getting some sparkley/opalescent action in the fired glaze. At least I'm mostly sure it was the pearl ash. And I can't completely remember what the other name of pearl ash is....calcium something or other...someone will know. Play around with the pearl ash, I don't know how it is at cone 10 though so test safely.
Take care
Krista Peterson
/
Laurie on mon 19 jan 04
Hi Mike,
I know the stuff you mean. What I am looking for is actually a glaze
and I think I may have found something like it in the archives, but I
would have to mix it and try it to see if it gives the same effect.
Sort of a milky opalescent, but definitely has a lot of bluish sparkles
and things in it. Maybe caused by the glaze fracturing or bubbling
inside and refracting light? I'm not sure.
Laurie
Sacramento, CA
On Jan 19, 2004, at 5:48 PM, Mike Gordon wrote:
> Laurie,
> There is a opalescent liquid you can apply to a cone 6 white glaze and
> refire it at c/018 I think. It's TOXIC as hell, apply it outside & be
> upwind, Mike Gordon
> On Jan 19, 2004, at 10:06 AM, Laurie Kneppel wrote:
>
>> Hi, I have a glaze question that is probably simple, but I haven't
>> really been able to find much info on my own. Maybe I am not looking
>> in
>> the right places or calling it the right name.
>>
>> When I was in college many years ago we had a glaze that would produce
>> little bluish white opalescent splotches here and there where it was
>> applied thick and dripped. I can't remember the name for anything, but
>> all the glazes were cone 10 reduction fired. I would love to find out
>> what sort of glaze produces this effect and how to get it on a
>> consistent basis. I still have a little 25 year old lidded jar glazed
>> with Honey Luster with splotches of that mystery glaze on it producing
>> little bluish white accents.
>>
>> Also is it possible to get this effect with a cone 6 reduction or
>> oxidation glaze?
>>
>> Thanks!
>>
>> Laurie
>> Sacramento, CA
>>
>> ______________________________________________________________________
>> _
>> _______
>> 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/
>>
>> Moderator of the list is Mel Jacobson who may be reached at
>> melpots@pclink.com.
>>
>
> _______________________________________________________________________
> _______
> 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/
>
> Moderator of the list is Mel Jacobson who may be reached at
> melpots@pclink.com.
>
Laurie Kneppel on mon 19 jan 04
Hi, I have a glaze question that is probably simple, but I haven't
really been able to find much info on my own. Maybe I am not looking in
the right places or calling it the right name.
When I was in college many years ago we had a glaze that would produce
little bluish white opalescent splotches here and there where it was
applied thick and dripped. I can't remember the name for anything, but
all the glazes were cone 10 reduction fired. I would love to find out
what sort of glaze produces this effect and how to get it on a
consistent basis. I still have a little 25 year old lidded jar glazed
with Honey Luster with splotches of that mystery glaze on it producing
little bluish white accents.
Also is it possible to get this effect with a cone 6 reduction or
oxidation glaze?
Thanks!
Laurie
Sacramento, CA
Earl Brunner on tue 20 jan 04
Are we talking maybe rutile blue here?
[Earl Brunner]
On Jan 19, 2004, at 10:06 AM, Laurie Kneppel wrote:
> When I was in college many years ago we had a glaze that would produce
> little bluish white opalescent splotches here and there where it was
> applied thick and dripped. I can't remember the name for anything, but
> all the glazes were cone 10 reduction fired. I would love to find out
> what sort of glaze produces this effect and how to get it on a
> consistent basis.
Bruce Girrell on tue 20 jan 04
> There is a opalescent liquid you can apply to a cone 6 white glaze and
> refire it at c/018 I think.
But that wouldn't be opalescence. It might be a lustre or mother of pearl
effect. Opalescence comes from within the glaze and is a result of the way
that the glaze refracts light. I got some beautiful opalescence in a recent
celadon test. It looks like the glaze is glowing. I don't know if I could
even reproduce it using the same glaze. Other effects - clay body
interaction, flowing, thickness, who knows what else - appear to be at play.
Bruce Girrell
in snowy northern Michigan
where we just unloaded our first kiln full of shinos. Another demon lover
enters our lives.
Ababi on tue 20 jan 04
I had it in ^04 ox on terracotta rich borax clear glazes
Ababi
.
Hendrix, Taylor J on tue 20 jan 04
Laurie,
I may be mis remembering but I do believe that phosphorous in small
amounts encourages opalescence like in the old chun glazes. That brain
trust ,Robert Tichane, talks about it in his book on ash glazes. P is
found in plant ashes as well as bone ash. The effect is, I think, due
to suspended microscopic bubbles in the glaze.
Taylor, in Waco
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Laurie
Sent: Tuesday, January 20, 2004 1:08 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Opalescence in Glazes
Hi Mike,
I know the stuff you mean. What I am looking for is actually a glaze
and I think I may have found something like it in the archives, but I
would have to mix it and try it to see if it gives the same effect.
...
Hank Murrow on tue 20 jan 04
On Jan 19, 2004, at 10:06 AM, Laurie Kneppel wrote:
> When I was in college many years ago we had a glaze that would produce
> little bluish white opalescent splotches here and there where it was
> applied thick and dripped. I can't remember the name for anything, but
> all the glazes were cone 10 reduction fired. I would love to find out
> what sort of glaze produces this effect and how to get it on a
> consistent basis.
Dear Laurie;
I have not noticed an explanation for the particular opalescence that
you observed, so herewith I enter the fray. I believe if you would make
a Currie Grid Tile with the C corner comprised of wood ash 40%, and
G-200 feldspar 60%, you will find after firing to Cone 10 reduction at
least two or three opalescent glazes in the lower right corner of the
tile. Perhaps cell #s 28 & 29 will show some opalescence. This effect
comes when the alumina is low, the silica is high, and especially when
there is phosphorus present (from the wood ash). You could also use
bone ash instead of wood ash for the calcium and phosphorus. The blue
colour is promoted by the presence of a little iron and lots of
potassium. The blue colour can be intensified by keeping the body under
the glaze low in titanium, as wellas by using a low titania kaolin in
the Currie Grid. Chuns are one type of Chinese glaze in this family.
Some try to emulate this effect by using boron to create the
opalescence at a lower temperature, but I feel they miss the mark (set
by the chinese wares) by a long way. However, one might say that they
are a different (and to many, pleasing) glaze.
Good Hunting!
Hank in Eugene
www.murrow.biz/hank
Laurie Kneppel on wed 21 jan 04
Hi Earl,
I am am starting to think from the descriptions I've gotten that
perhaps it may have been rutile blue. I will have to try the rutile
blue recipe on some of my stoneware stuff and see what it does. I see
on my two old pots I had put the ? glaze over honey luster. It ran like
crazy on one vase where I used a lot of it and stayed in place on a jar
that I splotched it on. This will be fun to experiment with! It's as
exciting as getting my Geil gas kiln hooked up at the end of last
summer and actually firing some oxblood reds that turned red! Then in
the fall I decided a refresher throwing class would be a good idea and
enrolled at one of the community colleges where the head of the
ceramics dept is a fellow CSUS grad and he uses a lot of the same glaze
recipes we had way back on those 70's ceramics classes that I used to
love! i read the names on the glaze test tile board and it was like
stepping into a time warp. A way cool time warp!
Laurie
Sacramento, CA - where the sun is shining for the first time in days!
On Jan 20, 2004, at 9:08 PM, Earl Brunner wrote:
> Are we talking maybe rutile blue here?
> [Earl Brunner]
>
>
> On Jan 19, 2004, at 10:06 AM, Laurie Kneppel wrote:
>
>> When I was in college many years ago we had a glaze that would produce
>> little bluish white opalescent splotches here and there where it was
>> applied thick and dripped. I can't remember the name for anything, but
>> all the glazes were cone 10 reduction fired. I would love to find out
>> what sort of glaze produces this effect and how to get it on a
>> consistent basis.
>
> _______________________________________________________________________
> _______
> 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/
>
> Moderator of the list is Mel Jacobson who may be reached at
> melpots@pclink.com.
>
Daniel Sommerfeld on wed 21 jan 04
Laurie,
You may be looking for a Rutile Based Glaze. I have used this glaze over
the past few years and will occasionally get a nice opalescent effect. The
whites and blues that you are describing are also characteristic of
Rutile. I've tried different deviations on the basic "Rutile Blue Glaze",
but I haven't tried them all and there are a bunch. I've always wanted to
try "Opal Blue", but I haven't gotten around to it.
Hope this helps,
Dan Sommerfeld
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