larry_kruzan on wed 9 jul 03
Hi All,
I just did my first crystalline glaze firing (glaze formula and firing
schedule below) and for the most part I am very happy with the results I
got. The one problem is that the glaze that settled into the bottoms of =
the
bowels is not smooth or glossy like the sides. In fact it almost looks
charred with an abundance of very black, very dull, small needle like =
crystalline
forms. It sort of looks like a empty bird nest. No glassy appearance =
at all in the bottoms.
Formula
Ferro Frit 3110 50
Zinc Oxide 28
Flint 22
Bentonite 3
Manganese Dioxide 2
Cobalt Carb. 0.5
Firing Schedule
Rate Temp F Hold Time
200Hr 800
150Hr 1250
300Hr 2100
100Hr 2282 12 Min
Quick Cool 2012 1 Hr 22 Min.
150Hr 2066 2 Hours
Shutdown and cool normally
Any input is welcome.
Thanks
Larry
Ababi on thu 10 jul 03
Hello Larry
What a recipe!
No no it is not the recipe!
The crystal glazes are very runny.
Drill a small hole in the middle of the plate.
I got the best result when I had done it after the bisque. This way,
when I added a little water I could tell where was the center- the water
also cooled the bit. Use 1 m"m bit I
By the way: In the last firing I made the holes before the firing and
missed in some plates the center.
See here
http://members4.clubphoto.com/ababi306910/1310421/
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910
http://www.matrix2000.co.nz/Matrix%20Demo/Ababi.htm
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of
larry_kruzan
Sent: Thursday, July 10, 2003 2:01 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Ceystalline glaze "problem?"
Hi All,
I just did my first crystalline glaze firing (glaze formula and firing
schedule below) and for the most part I am very happy with the results I
got. The one problem is that the glaze that settled into the bottoms of
the
bowels is not smooth or glossy like the sides. In fact it almost looks
charred with an abundance of very black, very dull, small needle like
crystalline
forms. It sort of looks like a empty bird nest. No glassy appearance
at all in the bottoms.
Formula
Ferro Frit 3110 50
Zinc Oxide 28
Flint 22
Bentonite 3
Manganese Dioxide 2
Cobalt Carb. 0.5
Firing Schedule
Rate Temp F Hold Time
200Hr 800
150Hr 1250
300Hr 2100
100Hr 2282 12 Min
Quick Cool 2012 1 Hr 22 Min.
150Hr 2066 2 Hours
Shutdown and cool normally
Any input is welcome.
Thanks
Larry
________________________________________________________________________
______
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.
william schran on thu 10 jul 03
Larry wrote: < I just did my first crystalline glaze firing (glaze
formula and firing
schedule below) and for the most part I am very happy with the results I
got. The one problem is that the glaze that settled into the bottoms of the
bowels is not smooth or glossy like the sides.>
Since the crystalline glazes run - they gotta flow somewhere. On the
inside of bowls you'll need to put a very thin coat of glaze at the
bottom interior and thicker as you move up towards the rim. How much
is a matter of the bowl shape, the thickness of the glaze and how
that particular glaze flows. Yah just gotta experiment.
Bill
Judi Buchanan on thu 10 jul 03
Larry, Some crystalline glazes just have this characteristic. I divide
the recipes into suitable for bowls or not with the first test tile. If
the drips are matt and rough the inside of bowls will be too. If the
drips are transparent hurray ! You get lovely pools with crystals
floating in them.
Judi Buchanan
-----Original Message-----
I just did my first crystalline glaze firing (glaze formula and firing
schedule below) and for the most part I am very happy with the results I
got. The one problem is that the glaze that settled into the bottoms of
the
bowels is not smooth or glossy like the sides. In fact it almost looks
charred with an abundance of very black, very dull, small needle like
crystalline
forms. It sort of looks like a empty bird nest. No glassy appearance
at all in the bottoms.
Thanks
Larry
| |
|
