Zoe Johnson on sun 2 nov 03
The older of the geokids took us out to scout a location for taking some
2nd graders fossil collecting. In the area, there is a bunch of crumbly
coal. The older geokid suggested that an interesting ash glaze could be
made with coal dust rather than ash. Any ideas? This is just speculation
at this point. She thinks that since the area has had volcanic water
circulation at points in the past, that the coal could have very
interesting trace minerals.
zoej
ASHPOTS@AOL.COM on mon 3 nov 03
I just finished a 3 day workshop Appalachian Center for Crafts. All the
students brought pieces to ashglaze and fire. We also made 11 ash and clay tests.
I had brought all kinds of stuff to mix with the ash. I had made a bunch of
test bowls. I make test bowls. I say that twice because ash glazes run. Anyway ,
we made ashglazes and sprayed all the pots and had the kiln firing at about
3PM. Wes Smith fired the kiln till about 3AM. It was unloaded at about 4PM
Sunday, Yesterday.
All the pots were super and we had some really cool test.Barnard with ash is
really nice.
To answer the question: try any thing , there are rules , so what ,, test ,
test , test
Also, saw Vinces magnet collection , his fridge is totally covered and he is
working on covering his stove. We didnt even see his whole collection.
What a blast being at the Appalacian Center for Crafts , Again
Mark
www.lookoutmountainpottery.com
Hal Mc Whinnie on mon 3 nov 03
it is worth an attempt, could be very interesting
Ababi on tue 4 nov 03
When I got, years ago from my teacher (5), I asked several coal
suppliers and found that there might be different analysis. The main
reason I stopped my tests were the unexpected results that pointed to
the possibility of track elements perhaps heavy metals.
I have an analysis for coal ash, I believe it is from Phil Rogers.
COAL ASH
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Coal Ash 100.0
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
CaO 0.456 4.82%
MgO 0.544 4.13%
Al2O3 2.006 38.53%
P2O5 0.052 1.38%
SiO2 4.393 49.76%
TiO2 0.091 1.38%
Al:Si 2.19
Expan. 5.19
ST 451.25
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
It is more like a dirty feldspar or clay or in-between.
I add here "Common ash"
common ash 100.0
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.140 8.44%
CaO 0.715 30.53%
MgO 0.145 4.45%
Al2O3 0.155 12.06%
P2O5 0.026 2.80%
SiO2 0.912 41.72%
K2O 0.075 5.39%
Na2O 0.065 3.06%
Al:Si 5.87
Expan. 9.85
ST 385.96
We can find one thing in common: The word ASH.
If you can have a lot of it I offer you to test it for track elements.
I offer you to test it in curries way. I would go it the other way
around use the pure ash as corner B
Yes It is possible!
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 Hal Mc
Whinnie
Sent: Monday, November 03, 2003 3:52 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: coal dust instead of ash in glazes?
it is worth an attempt, could be very interesting
________________________________________________________________________
______
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.
John K Dellow on tue 4 nov 03
Australian potter Bob Cunningham from Lithgow .An old cetre of pottery west of Sydney . HE use to fire with coal and made coal ash glazes. I have one piece and the glaze is very dry and pinkish . I have not looked at for a long time ,but think it looks a bit like a cross between Bezine and Shiraki.
john
John Dellow "the flower pot man"
Home Page http://www.welcome.to/jkdellow
http://digitalfire.com/education/people/dellow/
| |
|
