Marcia Selsor on tue 17 jun 03
Years ago I used a 50 cherry wood ash and 50 albany slip. It was a
beautiful gold with lots of depth. What are the "scaley" thing?
Marcia
John Rodgers wrote:
> I have a 5 gallon bucket of clay and oak ash mixed 50/50. I would like
> to do something worthwhile with it, besides throw it away.
>
> In it's current state, when applied like a glaze it fires to a brown,
> scaley, matt finish with lots of little black speckles, the latter
> coming from the clay body.
>
> Anyone have any suggestions on how to doctor this mix to get some sort
> of decent glaze or slip from it?
>
> Thanks,
>
> John Rodgers
> Birminmgham, AL
>
> ______________________________________________________________________________
> 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.
>
--
Tuscany in 2003
http://home.attbi.com/~m.selsor/Tuscany2003.html
Tony Ferguson on tue 17 jun 03
John,
I hope your eye surgery goes well. As for the ash mixture, try doing the
following:
add cobalt (1 to 3%) for a blue ash--this will probably be your best bet and
you could divide it down into other buckets and run the gamut of colorants
to get colored ash glazes.
add copper (3 to 5%) for a green to red ash glaze depending on the level of
reduction
You could also try adding a spar (this would drive it away from the matt as
well) and 8 to 12% iron oxide to obtain a temmoku like glaze (check out some
of the temmokus to see percentages and figure out an average "safe zone.").
I still think some of the best glazes are the simplest--especially if you
can compose them by using parts.
Thank you.
Tony Ferguson
On Lake Superior, where the sky meets the Lake
Stoneware, Porcelain, Raku and more
by Coleman, Ferguson, Winchester...
www.aquariusartgallery.com
218-727-6339
315 N. Lake Ave
Apt 312
Duluth, MN 55806
----- Original Message -----
From: "John Rodgers"
To:
Sent: Tuesday, June 17, 2003 9:16 PM
Subject: Clay/Ash Glaze???
> I have a 5 gallon bucket of clay and oak ash mixed 50/50. I would like
> to do something worthwhile with it, besides throw it away.
>
> In it's current state, when applied like a glaze it fires to a brown,
> scaley, matt finish with lots of little black speckles, the latter
> coming from the clay body.
>
> Anyone have any suggestions on how to doctor this mix to get some sort
> of decent glaze or slip from it?
>
> Thanks,
>
> John Rodgers
> Birminmgham, AL
>
>
____________________________________________________________________________
__
> 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.
>
pdp1@EARTHLINK.NET on tue 17 jun 03
Hey John,
I would take a glug of it and add some Iron Oxide...see what
it do...
...what cone are you intending to fire to?...or...it could
'run', so watch out...
I'd just maybe glaze the inside of some Bowl so as not to
have runny troubles with experiments like these...
Other especially 'crude' Oxides, or naturally occuring of
them as mineral things...I'd take a glug and try different
things like that...could be some gorgeous stuff!
See what it do reduction, see what it do oxidation...on and
endless on...
Phil
lasvegas
----- Original Message -----
From: "John Rodgers"
To:
Sent: Tuesday, June 17, 2003 7:16 PM
Subject: Clay/Ash Glaze???
> I have a 5 gallon bucket of clay and oak ash mixed 50/50.
I would like
> to do something worthwhile with it, besides throw it away.
>
> In it's current state, when applied like a glaze it fires
to a brown,
> scaley, matt finish with lots of little black speckles,
the latter
> coming from the clay body.
>
> Anyone have any suggestions on how to doctor this mix to
get some sort
> of decent glaze or slip from it?
>
> Thanks,
>
> John Rodgers
> Birminmgham, AL
>
>
____________________________________________________________
__________________
> 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.
Ann Brink on tue 17 jun 03
I would take a small test amount, add a little flux which may get reduce the
scaliness
and some opacifier to lighten the color- failing that, go ask your
pre-teenage relatives, "What is brown and scaley with little black
speckles?" and when they tell you, make some- you already have the glaze.
(sorry!)
Good firings,
Ann Brink in Lompoc CA
----- Original Message -----
From: "John Rodgers"
> I have a 5 gallon bucket of clay and oak ash mixed 50/50. I would like
> to do something worthwhile with it, besides throw it away.
>
> In it's current state, when applied like a glaze it fires to a brown,
> scaley, matt finish with lots of little black speckles, the latter
> coming from the clay body.
>
> Anyone have any suggestions on how to doctor this mix to get some sort
> of decent glaze or slip from it?
>
> Thanks,
>
> John Rodgers
> Birminmgham, AL
>
>
____________________________________________________________________________
__
> 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 Rodgers on tue 17 jun 03
I have a 5 gallon bucket of clay and oak ash mixed 50/50. I would like
to do something worthwhile with it, besides throw it away.
In it's current state, when applied like a glaze it fires to a brown,
scaley, matt finish with lots of little black speckles, the latter
coming from the clay body.
Anyone have any suggestions on how to doctor this mix to get some sort
of decent glaze or slip from it?
Thanks,
John Rodgers
Birminmgham, AL
Roly Beevor on wed 18 jun 03
Dear John
The results of my limited experiments (for what they are worth):
My first attempt at ash glaze produced the sort of brown matt you describe.
The ash was (probably) mainly beech and bird cherry with some ash oak and
pine. I had washed the ash.
I tried a straight mixture of clay and ash (as you have) and mixing in
feldspar (to equal weight) and adding some iron oxide. There was not a huge
difference between the various samples.
On the college technician's advice I didn't wash the second batch. I didn't
bother with the feldspar and iron. The result is a not exciting but
acceptable matt green, examples on
www.summerhillpotters.org.uk/rolybeevor.html
Tony Birks gives a nice anecdote about getting almond shell ash from a
friend in Portugal. He packs it up in plastic but it burns its way out and
makes a mess all over customs. I should think he was lucky not to get
arrested. When he gets home he makes glaze with it but gets the same sort
of dull result as your oak. (I havn't got the reference handy, but I can
give it if anyone wants).
I guess that really loading up with feldspar would give you a glossier
finish, and dilute the brown which is from iron? and possibly a contaminant
rather than original to the oak?
What are my qualifications for saying this? None, well I did read a book
once. However since the content of the ash is unknown my guess may have the
same chance as any of being useful.
I look forward to reading the expert opinions.
And why am I making such crude experiments rather than doing line blends as
recommended? Love of serendipity, desire to get back to a simpler way of
life/ understand how we got here, lazy nature, stubborn refusal to take
advice, desperate attempt to have my own thing for the group exhibition
rather than stick to a safe glaze and only two firings possible, take any or
all reasons.
Roland
John Rodgers wrote:
> I have a 5 gallon bucket of clay and oak ash mixed 50/50. I would like
> to do something worthwhile with it, besides throw it away.
>
> In it's current state, when applied like a glaze it fires to a brown,
> scaley, matt finish with lots of little black speckles, the latter
> coming from the clay body.
>
> Anyone have any suggestions on how to doctor this mix to get some sort
> of decent glaze or slip from it?
>
> Thanks,
>
> John Rodgers
> Birminmgham, AL
>
Mondloch on wed 18 jun 03
> I have a 5 gallon bucket of clay and oak ash mixed 50/50. I would like
> to do something worthwhile with it, besides throw it away.
Hi John,
just an idea - I mix a bucketful of approximate equal parts wood ash, clay(I
use Redart), and my scrap glaze(which would be mostly feldspar). I test this
mix first. It's usually very matt so then I add some flint- maybe 10-20% -
to bring up the shine some.
So I end up with a practically free, easy glaze that uses up my scrap glaze.
Mine comes out deep green, but I'd say that's from the iron in the Redart as
much as anything. If your mix has a non-iron bearing clay, you may get a
clearer glaze that you could color otherwise if you want. It's not going to
be repeatable precisely but then ash glazes are going to be variable anyway.
good luck,
Sylvia
---
Mark & Sylvia Mondloch
Silver Creek Pottery & Forge
W6725 Hwy 144
Random Lake ,Wi 53075
HotArt@silvercreekpottery.com
http://www.silvercreekpottery.com
Craig Martell on wed 18 jun 03
Hello John:
If you would like to actually know what you've got and what you're adding
and have this all make sense so you can repeat a satisfactory result you
may want to dry out a quart or so of the ash/clay slurry. Then you can do
line blends, biaxials, triaxials, quads, by weighing all the individual
ingredients. Mucking about by adding this or that to a questionable
mixture eats up a lot of time and yields very little info. To make this
work I would think a mixture of flux, or combos of fluxes, and definitely
some silica, would be necessary.
Once you have a melt and surface that you like you could proceed with some
color blends. I have no idea what your mind's eye sees as a good result so
I really can't offer any more than: Do some controlled blends and
tests. You'll hopefully find what you want.
regards, Craig Martell Hopewell, Oregon
Richard Aerni on wed 18 jun 03
On Tue, 17 Jun 2003 21:16:27 -0500, John Rodgers
wrote:
>I have a 5 gallon bucket of clay and oak ash mixed 50/50. I would like
>to do something worthwhile with it, besides throw it away.
>
> In it's current state, when applied like a glaze it fires to a brown,
>scaley, matt finish with lots of little black speckles, the latter
>coming from the clay body.
>
>Anyone have any suggestions on how to doctor this mix to get some sort
>of decent glaze or slip from it?
John,
This is an example of an open ended question which begs for more details...
For example, what type of clay is it mixed with?
What temperature, and in which type atmosphere, do you fire?
What kind of effects did you have in mind when you made, and then fired
this mix?
I've noticed a number of replies which answer your query without referring
to these details...
Some say this is fine, their mixes with clay and ash, when the clay is
Albany or Red Art, worked fine... My question would be, given similar
firing temps and atmospheres, why redart and Albany melt and your anonymous
clay does not? The answer, or even your hunch, on that question should set
you off in the right direction. Keep this in mind...when you go to your
clay supplier and ask them for clay to work and fire, do you pay any
attention to it's proper firing temp? Not all clays are similar...
Forgive me if I sound too simplistic, but I am only able to infer your
mindset from your rather vague question. I imagine if you reframe the
question giving answers to the above three questions, you'll get a number
of helpful replies.
Best,
Richard Aerni
Bloomfield, NY
Roger Korn on wed 18 jun 03
..."scaley"... sounds like too much alumina and not enough silica, and
..."matte"... maybe not melted, so needs higher firing point or more
flux. What is the firing temperature here?
Need more info. Listen to Craig Martell to get to the bottom of this.
Good luck,
Roger
John Rodgers wrote:
> I have a 5 gallon bucket of clay and oak ash mixed 50/50. I would like
> to do something worthwhile with it, besides throw it away.
>
> In it's current state, when applied like a glaze it fires to a brown,
> scaley, matt finish with lots of little black speckles, the latter
> coming from the clay body.
>
> Anyone have any suggestions on how to doctor this mix to get some sort
> of decent glaze or slip from it?
>
> Thanks,
>
> John Rodgers
> Birminmgham, AL
>
> ______________________________________________________________________________
>
> 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.
>
--
Roger Korn
McKay Creek Ceramics
In AZ: PO Box 463
4215 Culpepper Ranch Rd
Rimrock, AZ 86335
928-567-5699 <-
In OR: PO Box 436
31330 NW Pacific Ave.
North Plains, OR 97133
503-647-5464
Louis Katz on wed 18 jun 03
Is the Oak ash all oak, or is there newspaper or charcoal ash in it?
Paper ash is mostly clay and paper has a much higher percentage of ash
by weight than oak. So if you use much paper, you don't get very "real"
wood ash.
Most barbeque " charcoal" is mostly mineral coal. -Much different ash
Was your ash well burnt or did it have much black charcoal in it?
If it was well burnt was it burnt in a high temperature device, like a
wood kiln?
If so the ash may have lost its alkali content.
Was your ash washed? This removes alkalis.
Try adding whiting, or Neph Sy.
Louis
On Wednesday, June 18, 2003, at 02:06 PM, Roger Korn wrote:
> ..."scaley"... sounds like too much alumina and not enough silica, and
> ..."matte"... maybe not melted, so needs higher firing point or more
> flux. What is the firing temperature here?
>
> Need more info. Listen to Craig Martell to get to the bottom of this.
>
> Good luck,
> Roger
>
> John Rodgers wrote:
>
>> I have a 5 gallon bucket of clay and oak ash mixed 50/50. I would like
>> to do something worthwhile with it, besides throw it away.
>>
>> In it's current state, when applied like a glaze it fires to a brown,
>> scaley, matt finish with lots of little black speckles, the latter
>> coming from the clay body.
>>
>> Anyone have any suggestions on how to doctor this mix to get some sort
>> of decent glaze or slip from it?
>>
>> Thanks,
>>
>> John Rodgers
>> Birminmgham, AL
>>
>> ______________________________________________________________________
>> ________
>>
>> 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.
>>
>
> --
> Roger Korn
> McKay Creek Ceramics
> In AZ: PO Box 463
> 4215 Culpepper Ranch Rd
> Rimrock, AZ 86335
> 928-567-5699 <-
> In OR: PO Box 436
> 31330 NW Pacific Ave.
> North Plains, OR 97133
> 503-647-5464
>
> _______________________________________________________________________
> _______
> 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.
>
Ron Roy on thu 19 jun 03
What kind of clay and what cone do you fire to - ox or reduc?
RR
>I have a 5 gallon bucket of clay and oak ash mixed 50/50. I would like
>to do something worthwhile with it, besides throw it away.
>
> In it's current state, when applied like a glaze it fires to a brown,
>scaley, matt finish with lots of little black speckles, the latter
>coming from the clay body.
>
>Anyone have any suggestions on how to doctor this mix to get some sort
>of decent glaze or slip from it?
>
>Thanks,
>
>John Rodgers
>Birminmgham, AL
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Ababi on thu 19 jun 03
I think you guys ( and girls) are too hard on John!
Perhaps John ( like me) does not know what is in his ash?
John is not happy with his glaze.
It is true John we don't know how high you fire, but I shall not fire you from ClayArt!
OK OK oak. Sorry but I shall go on!
I don't have analysis for oak
and it fires brown. Let's decide you have an Albany slip glaze:
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
common ash 50.00
Albany Slip Clay 50.00
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.163 6.47%
CaO 0.647 17.75%
MgO 0.190 3.75%
Al2O3 0.297 14.78%
P2O5 0.017 1.20%
SiO2 1.890 55.55%
TiO2 0.013 0.50%
K2O 0.098 4.49%
Na2O 0.065 1.97%
Al:Si 6.37
Expan. 7.92
ST 385.00
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
In ^6 it will give you a silky matte.
You have there about 4% iron.
Now let me try another thing:
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
common ash 50.00
RedArt Clay 50.00
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.197 6.24%
CaO 0.619 13.21%
MgO 0.184 2.83%
Al2O3 0.380 14.73%
P2O5 0.021 1.11%
SiO2 2.423 55.41%
TiO2 0.020 0.62%
K2O 0.130 4.64%
Na2O 0.067 1.59%
Al:Si 6.38
Expan. 7.85
ST 380.03
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Here you have about 6% of iron.
to any coloring you do, you must think about the high iron.
Yellow: As it is or try to add 5 titanium and 5 rutile.
I shall try to adjust it:
You must mix well and dry. divide it to 100 gram batches:
try to add 10 and 15% flint ( ^6)
If you want it runny
instead of the flint try 10 20 or 30% frit 3110. ( it might help with blues and greens)
I think this is an interesting case were Ian currie's grid cannot help!
unless there is a way to start with corner A or B!
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.israel-ceramics.org/membersGallery/personalpage.asp?MID=507
Russel Fouts on thu 19 jun 03
John
No one has mentioned this yet but it seems pretty obvious to me. Since
the glaze is clay and ash and dry, add more ash until you get something
that looks more like a glaze. Watch out for running.
I did a lot of work with simple clay and ash glazes in school, can be
really nice.
Russel
--
Russel Fouts
Mes Potes & Mes Pots
Brussels, Belgium
Tel: +32 2 223 02 75
Mobile: +32 476 55 38 75
Http://www.mypots.com
Home of "The Potters Portal"
Over 2300 Pottery Related Links!
Updated frequently
My work can also be seen on:
The World Crafts Council International Site: http://www.wccwis.gr
The World Crafts Council Belgium Site: http://wcc-bf.org (English
Pages)
EasyCraft: http://www.easycraft.org
"To announce that there must be no criticism of the president, or that
we are to stand by the president, right or wrong, is not only
unpatriotic and servile, but is morally treasonable to the American
public." --U.S. President (and Nobel Peace Prize winner) Theodore
Roosevelt.
Graeme Anderson on thu 19 jun 03
John,
Perhaps you could try a different ratio of ash to clay - say 60/40 or 70/30.
If you have more oak ash available, you could try taking some of the mix
from the bucket and adding more ash, and do a few test tiles.
This, of course, is if you want the glaze to be only a straight ash/clay mix
that you can repeat with your materials.
Cheers. Graeme.
Joe Coniglio on thu 19 jun 03
Sounds like fun.
Many are correct to say without specifics on the firing who's to say.
But knowing a 50/50 probably going to have to fire rather hot to C6-C10 with
a reduction aspect to trick it out...
The best suggestions I read so are are
1) Test in a bowl so it's doesn't over run
2) Add feldspar to shine it up
3) the various low % oxide pigments for shading
---
...and if it was my bucket I'd
4) Add some silica sand to your clay body so it may react better with your
mixture and get a little more glassy at lower temperatures.
5) I'd dry the ash glaze mix out a little bit and re-add the moisture
in the form of dissolved borax (20 muleteem borax with not other additives
it's a borate for fluxing)
6) Toss in a sampling in any part desired (like salting your food), some
soda ash and some bone ash---but remember you might not be able to duplicate
your concoction without measured amounts and even then you already may have
too many variables in only the clay and ash alone.
7) Make sure it strained "real nice"
8) Test with brushing it on, single dip and double dips
| |
|
