Eleanora Eden on mon 1 mar 10
My local hardware store says he hasn't been able to find rotten stone
powder for about 6 years. Not finding my own box of it, I am looking for
some. Seems to have gotten very expensive.
So, my question is: is there a commonly used substitute that I would find
in my ceramics studio or could order more cheaply than $10/lb plus shipping=
.
Thanks,
Eleanora
--
Bellows Falls Vermont
www.eleanoraeden.com
gayle bair on mon 1 mar 10
try Ace hardware
=3D
http://www.acehardwaresuperstore.com/rottenstone-polishing-compound-p-2572=
=3D
.html?ref=3D3D42
Gayle Bair
Bainbridge Island WA
Tucson AZ
gayle@claybair.com
www.claybair.com
On Mar 1, 2010, at 8:40 AM, Eleanora Eden wrote:
> My local hardware store says he hasn't been able to find rotten stone
> powder for about 6 years. Not finding my own box of it, I am looking =3D
for
> some. Seems to have gotten very expensive.
>=3D20
> So, my question is: is there a commonly used substitute that I would =3D
find
> in my ceramics studio or could order more cheaply than $10/lb plus =3D
shipping.
>=3D20
> Thanks,
>=3D20
> Eleanora
>=3D20
>=3D20
> --
> Bellows Falls Vermont
> www.eleanoraeden.com
John Connolly on mon 1 mar 10
You should just be able to follow your nose to rotten stone. When working t=
=3D
oward a satin finish, the careful use of pumice is one of the best ways.
John Connolly in Ensenada, Baja California, Mexico
--- On Mon, 3/1/10, Eleanora Eden wrote:
From: Eleanora Eden
Subject: rotten stone powder substitute
To: Clayart@LSV.CERAMICS.ORG
Date: Monday, March 1, 2010, 7:40 AM
My local hardware store says he hasn't been able to find rotten stone
powder for about 6 years.=3DA0 Not finding my own box of it, I am looking f=
or
some.=3DA0 Seems to have gotten very expensive.
So, my question is:=3DA0 is there a commonly used substitute that I would f=
in=3D
d
in my ceramics studio or could order more cheaply than $10/lb plus shipping=
=3D
.
Thanks,
Eleanora
--
Bellows Falls Vermont
www.eleanoraeden.com
=3D0A=3D0A=3D0A
ivor & olive lewis on tue 2 mar 10
Dear Eleanora Eden,
Try Tripoli powder.
Rotten stone is described as a decomposed siliceous limestone.
Unless it is needed for polishing why not substitute Wollastonite, or more
cheaply, Whiting and Ground flint.
Regards,
Ivor Lewis,
Redhill,
South Australia
John Britt on tue 2 mar 10
Eleanora,
There is no sub I know of but you can get the analysis on Digital Fire
(Insight) and perhaps use your glaze software to concoct one?! I know tha=
=3D
t
David H. and Lili had great subs for Albany slip!
It has a bunch of iron and magnesium oxide so you will need to consider
that. (whiting, wollastonite, silica won't do it.)
I would check with a supplier because if Ace gets it...then others can. J=
=3D
ust
not that high of a demand so it is expensive.=3D20
I did find it cheaply in the railroad car size. I think it was about $200=
=3D
0
for a train car of it. But the bagging and shipping would kill you!
Check around some more. Perhaps someone who is coming for a visit can br=
=3D
ing
some from the big city.=3D20
It is great stuff!
John=3D20
James Freeman on tue 2 mar 10
Hi, guys...
I think we are starting to miss the boat a bit here. Maybe we are too
programmed to think like potters. I don't believe the chemical makeup of
rottenstone has anything to do with it's use as a finishing tool. I believ=
e
it is rather a combination of it's mildly abrasive qualities, it's initial
grit size, and the physical properties of the grit. Rottenstone readily
breaks down into finer and finer particles as it is used. Thus, it can be
thought of as a progressive grit, making itself finer and finer, and thereb=
y
making the surface smoother and smoother. One of our ceramic colorants,
crocus martis acts in a similar way, and is also used as a polishing
compound, especially for metal. I did not mention it in this case as it's
propensity to stain the heck out of anything porous that it touches renders
it unsuitable for use on wood.
I don't think whiting would be abrasive enough to do anything, but not
sure. Silica is out of the question. Our 325 mesh silica flour is the
equivalent of using 320 grit sandpaper. It would scratch the surface rathe=
r
than polish it. The grains are so hard that, while they would eventually
break down and get finer, you would be there all day, and would probably
sand completely through your finish long before you got to that point.
All the best.
...James
James Freeman
"All I say is by way of discourse, and nothing by way of advice. I should
not speak so boldly if it were my due to be believed."
-Michel de Montaigne
http://www.jamesfreemanstudio.com
http://www.flickr.com/photos/jamesfreemanstudio/
http://www.jamesfreemanstudio.com/clayart/
On Tue, Mar 2, 2010 at 10:08 AM, John Britt wro=
te:
> Eleanora,
>
> There is no sub I know of but you can get the analysis on Digital Fire
> (Insight) and perhaps use your glaze software to concoct one?! I know tha=
t
> David H. and Lili had great subs for Albany slip!
>
> It has a bunch of iron and magnesium oxide so you will need to consider
> that. (whiting, wollastonite, silica won't do it.)
>
> I would check with a supplier because if Ace gets it...then others can.
> Just
> not that high of a demand so it is expensive.
>
> I did find it cheaply in the railroad car size. I think it was about $200=
0
> for a train car of it. But the bagging and shipping would kill you!
>
> Check around some more. Perhaps someone who is coming for a visit can
> bring
> some from the big city.
>
> It is great stuff!
>
> John
>
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