Neon-Cat on mon 26 apr 10
Nice glaze, Michael!
Clayarters, his porcelain, rocks -- I love it and even threw a couple
of things with it. So dense and hard and interesting, it fires a nice
white. I used it for coiling and handbuilding, too -- good results!
The customer service and friendly chat plus the to-the-door delivery
was as nice as the clay.
Marian
www.neon-cat.com
On Mon, Apr 26, 2010 at 8:16 PM, Michael Wendt wrote:
> http://www.wendtpottery.com/kitchen.htm
> The pitcher and the crock are MSH.
Richard Aerni on mon 26 apr 10
Just to clarify, as I get it all the time, being an "ash" potter, but =3D
volcanic ash is simply pulverized rock, mostly basaltic in nature. =3D
There is nothing ashlike, as we understand ash, in it. Wood ash, which =3D
is what most potters use in their glazes, is the byproduct of combusted =3D
wood.
Sorry if I'm overstating the obvious, but sometimes it needs to be =3D
said...
Richard
Richard Aerni
Rochester, NY =3D20
www.richardaerni.com
Eric Hansen on mon 26 apr 10
Richard: Really nice work at your web site!
On Mon, Apr 26, 2010 at 4:04 PM, Richard Aerni wro=
te:
> Just to clarify, as I get it all the time, being an "ash" potter, but
> volcanic ash is simply pulverized rock, mostly basaltic in nature. There=
is
> nothing ashlike, as we understand ash, in it. Wood ash, which is what mo=
st
> potters use in their glazes, is the byproduct of combusted wood.
> Sorry if I'm overstating the obvious, but sometimes it needs to be said..=
.
> Richard
> Richard Aerni
> Rochester, NY
> www.richardaerni.com
>
Michael Wendt on mon 26 apr 10
I have used Mt St Helens Volcanic ash as a main glaze since
it blew May 18, 1980.
By the mid 80s, I had 8 full time helpers in my studio and
we fired 4 kiln loads a week of MSH pots. It lasted nearly
10 years!
Still popular, it is no longer our best seller.
See MSH on page:
http://www.wendtpottery.com/kitchen.htm
The pitcher and the crock are MSH.
The ash that fell on Idaho was so fine it stays suspended in
the bucket for several minutes. I also found a local glaze
clay that is almost identical to MSH in chemical analysis
but is plastic enough to add better suspension and adhesion
without changing the color of the actual MSH. I add a little
of this clay to help suspend the ash.
regards,
Michael Wendt
Richard Aerni on tue 27 apr 10
A bit of a follow up...
Think about where the volcanic ash comes from...mostly magma from the =3D
earth's mantle. Most of that rock (about 99%) is made up of the most =3D
common eight elements in the earth's mantle, Oxygen, Silica, Alumina =3D
(those three account for about 84%), Iron, Magnesium, Calcium, Sodium, =3D
and Potassium. These must sound familiar, as they make up granite, =3D
feldspar, all of those heavy igneous rocks we see, including clay =3D
(mostly weathered granite). So, think about it, the volcanic fluff that =
=3D
is spewed up into the atmosphere and falls to earth, that we call =3D
volcanic ash, is really very close to having a claylike composition, or =3D
a composition much like a cone 10 glaze. After all, the core =3D
temperature of the mantle is remarkably close to a high temperature =3D
stoneware kiln (just making a rough estimate here). When that volcanic =3D
ash falls to earth, and is weathered for a few millennia, it becomes =3D
montmorillinite, smectite, bentonite. =3D20
Just rambling here...but mineralogy and geology are remarkably useful =3D
and fascinating sciences for a potter to dabble in. =3D20
Now, have to go...a week on Cape Cod looms, and wouldn't you know it, =3D
it's snowing outside my house right now!
Best to all,
Richard
Richard Aerni
Rochester, NY =3D20
www.richardaerni.com
Arnold Howard on tue 27 apr 10
Is there a website or book that lists the composition of
each volcanic ash deposit around the world?
Sincerely,
Arnold Howard
Paragon Industries, L.P., Mesquite, Texas USA
ahoward@paragonweb.com / www.paragonweb.com
Lee Love on tue 27 apr 10
Actually, it IS ash. Just not wood ash. Before I went to Japan, One of
the ways I limited my glaze pallet was by only using glazes that had some
form of ash in them. Now I am doing shinos without soda ash.
ASH [=3DC3=3DA6=3DCA=3D83]
*n* (in Britain)
**
-----------------------------
ash1
*n*
*1.* (Chemistry / Elements & Compounds) the nonvolatile products and residu=
=3D
e
formed when matter is burnt
*2.* (Chemistry / Elements & Compounds) any of certain compounds formed by
burning See soda ash
*3.* (Earth Sciences / Geological Science) fine particles of lava thrown ou=
=3D
t
by an erupting volcano
*4.* (Fine Arts & Visual Arts / Colours) a light silvery grey colour, often
with a brownish tinge See also
ashesRelated adj
cinereous
[Old English *=3DC3=3DA6sce;* related to Old Norse, Old High German *aska,*=
Got=3D
hic *
azg=3DC5=3D8D,* Latin *aridus* dry]
--
Lee, a Mashiko potter in Minneapolis
http://mashikopots.blogspot.com/
=3DE2=3D80=3D9CObserve the wonders as they occur around you. Don't claim th=
em. Fe=3D
el the
artistry moving through and be silent.=3DE2=3D80=3D9D --Rumi
Des & Jan Howard on tue 27 apr 10
Arnold
I don't know about the rest of the world.
The volcanic "ash" deposit 15 km from our workshop
Has the following composition.
XRD % 0.39 Na2O 2.7 K2O 0.56 MgO 0.01 CaO 23.2
Al2O3 63.8 SiO2 1.6 Fe2O3 7.74 LOI
XRF Quartz, illite, muscovite, dickite (same chemical
formula as kaolinite, different crystal structure).
Des
Arnold Howard wrote:
> Is there a website or book that lists the composition of
> each volcanic ash deposit around the world?
--
Des & Jan Howard
Lue Pottery
Lue NSW
Australia
2850
02 6373 6419
www.luepottery.hwy.com.au
-32.656072 149.840624
ivor & olive lewis on wed 28 apr 10
Dear Arnold Howard,
"Understanding the Earth, a Reader in Earth Sciences" Ed I. G. Gass, Open
University Press, ISBN 85141-308-0 is a useful starting place. Among other
things it discusses the Question and significance of Iceland as a major
centre of Vulcanism.
I will scan a table from page 309 for you, which lists compositions of some
of the more important Igneous Rocks.
Volcanic ash, a finely divided residue has a singular advantage over massiv=
e
Igneous rocks, or metamorphic rocks derived from then, The only effort
needed to process the stuff is to sieve it. Bulk rocks, Granite, Basalt,
Andesite and so forth need power to batter them into an impalpable powder
suitable for inclusion in a glaze.
Do not expect to produce transparent colourless glazes from either source,
most igneous rocks have a proportion of one Iron oxide or another in them.
Sincere regards,
Ivor Lewis,
Redhill,
South Australia
Michael McDowell on wed 28 apr 10
Lee love wrote yesterday:
"Actually, it IS ash. Just not wood ash."
I'll have to take exception to this Lee. It is NOT ash. Not in the sense
that is the residue of anything burning. I think that in the instance of ou=
r
Pacific Rim, high silica, volcanoes it is better thought of as a naturally
occurring frit. The magma pool that the volcanoes are drawing off is largel=
y
the result of the subducted continental plate melting as it is forced under
the opposing plate.
Michael McDowell
Whatcom County, WA, USA
michael@mcdowellpottery.com
http://www.McDowellPottery.com
Lee Love on wed 28 apr 10
On Wed, Apr 28, 2010 at 12:32 PM, Michael McDowell
wrote:
> Lee love wrote yesterday:
>
> "Actually, it IS ash. =3DA0Just not wood ash."
>
> I'll have to take exception to this Lee.
Third definition of ash:
3. (Earth Sciences / Geological Science) fine particles of lava thrown
out by an erupting volcano
We've got soda ash too. Not to be confused with wood ash.
--
Lee, a Mashiko potter in Minneapolis
http://mashikopots.blogspot.com/
=3D93Observe the wonders as they occur around you. Don't claim them. Feel
the artistry moving through and be silent.=3D94 --Rumi
Paul Herman on wed 28 apr 10
Michael,
Actually, according to Webster, volcanic ash IS ash, though it is not
a residue of anything burning. Residue of burned material is only one
of many types of ash. The word "ash" has a much broader meaning than
just wood ashes.
Definition 1 c : fine particles of mineral matter ejected from a
volcanic vent during an explosive eruption
Though you (as a potter) might think it's better thought of as a frit,
very few people but a potter would know what "frit" means. Pretty much
everyone knows what "volcanic ash" means.
I agree that volcanic ash is not wood ash.
best wishes,
Paul Herman
Great Basin Pottery
Doyle, California US
www.greatbasinpottery.com/
On Apr 28, 2010, at 10:32 AM, Michael McDowell wrote:
> Lee love wrote yesterday:
>
> "Actually, it IS ash. Just not wood ash."
>
> I'll have to take exception to this Lee. It is NOT ash. Not in the
> sense
> that is the residue of anything burning. I think that in the
> instance of our
> Pacific Rim, high silica, volcanoes it is better thought of as a
> naturally
> occurring frit. The magma pool that the volcanoes are drawing off is
> largely
> the result of the subducted continental plate melting as it is
> forced under
> the opposing plate.
>
> Michael McDowell
Lee Love on wed 28 apr 10
On Wed, Apr 28, 2010 at 5:55 PM, Paul Herman w=
=3D
rote:
> Though you (as a potter) might think it's better thought of as a frit,
> very few people but a potter would know what "frit" means. Pretty much
> everyone knows what "volcanic ash" means.
There is no "ash" in soda ash.. It is called soda ash because we
used to get it from burning seaweed. We can honestly say soda ash is
not ash. Whereas, volcanic ash was probably named ash because of its
physical, rathern than chemical similarities to organic ash.
How about bone ash? It is most similar to wood ash, in that it
is created by burning an original organic product. It does not look
anything like ash. Bones pretty much keep their shape (ask anybody
who has participated in the cremation ceremony at a tradtional
funeral.) The soften bones are ground into a powder to make the
chemical product. In Japan, they keep the bones whole from
cremation, and throw the "ash" away. You could say the chemical
process of making bone ash is similar to wood ash, but the physical
properties of the final product are not similar.
Origins of the word "ash" are interesting too. The roots seem
to key on dryness, get dry and arid:
Origin:
bef. 950; ME a ( i ) sshe, OE asce, =3DC3=3DA6sce; c. Fris esk, D asch,
ON, OHG aska (G Asche ), Goth azgo < Gmc *ask=3DC5=3D8Dn- (with Goth
unexplained); akin to L =3DC4=3D81r=3DC4=3D93re be dry ( see arid), Tochar=
ian =3DC4=3D
=3D81s- get
dry, Skt =3DC4=3D81=3DCC=3D81sa- ashes, Hittite hassi on the hearth; < IE=
*HaHs-
--
Lee, a Mashiko potter in Minneapolis
http://mashikopots.blogspot.com/
=3DE2=3D80=3D9CObserve the wonders as they occur around you. Don't claim th=
em. Fe=3D
el
the artistry moving through and be silent.=3DE2=3D80=3D9D --Rumi
phil on thu 29 apr 10
Yes...
And an ash is an ash isa naaash is anash isa nash is...sometimes not an
ash...except when it is.
Then there is also -
Making an ash of one's self.
Get your ash outta here...or, I better get my ash outta here...
My tired ash...my saggy ash...a piece of ash...
etc...
----- Original Message -----
From: "Lee Love"
On Wed, Apr 28, 2010 at 12:32 PM, Michael McDowell
wrote:
> Lee love wrote yesterday:
>
> "Actually, it IS ash. Just not wood ash."
>
> I'll have to take exception to this Lee.
Third definition of ash:
3. (Earth Sciences / Geological Science) fine particles of lava thrown
out by an erupting volcano
We've got soda ash too. Not to be confused with wood ash.
--
Lee
David Todd on thu 29 apr 10
Phil
Good ash is hard to find.
David Todd
www.otterrafting.com
Lee Love on mon 3 may 10
On Thu, Apr 29, 2010 at 6:48 PM, David Todd wrot=
=3D
e:
> Phil
>
> Good ash is hard to find.
>
I usually do one test of an ash glaze using synthetic ash, to give me
a baseline. It is especially helpful if you are adjusting the other
parts of the glaze, because you have an analysis, unlike natural
woodash.
--
Lee, a Mashiko potter in Minneapolis
http://mashikopots.blogspot.com/
=3D93Observe the wonders as they occur around you. Don't claim them. Feel
the artistry moving through and be silent.=3D94 --Rumi
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