Martin Rice on wed 10 apr 02
I'm about to pit fire a few pieces. This will be my first attempt. I'll do
it with pieces that will not be bisqued (though I'll heat them in the oven
overnight to reduce thermal shock. I never burnished these pieces when the
time was right. What I was wondering was whether it would make any
difference if I were to sand them? If so, I certainly would, but I don't
want to spend the time doing that if there will be no advantage to doing so.
Thanks,
Martin
Lagunas de Barú, Costa Rica
www.rice-family.org
Completely revised and updated 4/1/02
Lee Love on thu 11 apr 02
----- Original Message -----
From: "BVCuma"
>If you are to sand them it will not give you a burnished effect.
The pots out of the Yohen chamber of the Noborigama, after they are
fired,
are sanded, polished with a 3M pad and then rubbed with a soft cotton cloth.
They end up with a satin finish. You'd never imagine they'd look this way
right out of the kiln. They are dark and dull before they are polished.
--
Lee in Mashiko
"The lyfe so short, the craft so long to learne." - Geoffrey Chaucer
(c.
1340-1400).-
._____________________________________________
| Lee Love ^/(o\| Practice before theory.
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| Ikiru@kami.com |\o)/v - Sotetsu Yanagi - |
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"All weaves one fabric; all things give
Power unto all things to work and live." - Goethe -
Martin Rice on thu 11 apr 02
Thanks so much, Bruce. I will try both ways and see what happens.
Regards,
Martin
Lagunas de Barú, Costa Rica
www.rice-family.org
-----Original Message-----
From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
Behalf Of BVCuma
Sent: Wednesday, April 10, 2002 10:11 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: [CLAYART] Burnishing vs Sanding
>>I never burnished these pieces when the
time was right. What I was wondering was whether it would make any
difference if I were to sand them?<<
___________________________
Hi Martin,
If you are to sand them it will not give you a burnished effect.
If your clay is grogged you will get a rough and pitted surface,
varied to the degree of grog content and grade of sandpaper.
You may get a chance when sanding to refine your form...
but you'll not get a sealed and "waxed" look acheived
by the terra sigillata application and burnishing "work"
Go ahead and fire up those pots as they are...
(try sanding a few anyway..beware of dust inhalation))
then you can compare with your burnished ones later.
See the difference and what you prefer.
Bruce
ps. if I wish to refine the form
I use a small strip of scouring pad from the kitchen.
They last a long time and don't leave scratch marks.
(usually the joins of a handle or a run over the lip of a cup)
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BVCuma on thu 11 apr 02
>>I never burnished these pieces when the
time was right. What I was wondering was whether it would make any
difference if I were to sand them?<<
___________________________
Hi Martin,
If you are to sand them it will not give you a burnished effect.
If your clay is grogged you will get a rough and pitted surface,
varied to the degree of grog content and grade of sandpaper.
You may get a chance when sanding to refine your form...
but you'll not get a sealed and "waxed" look acheived
by the terra sigillata application and burnishing "work"
Go ahead and fire up those pots as they are...
(try sanding a few anyway..beware of dust inhalation))
then you can compare with your burnished ones later.
See the difference and what you prefer.
Bruce
ps. if I wish to refine the form
I use a small strip of scouring pad from the kitchen.
They last a long time and don't leave scratch marks.
(usually the joins of a handle or a run over the lip of a cup)
LOGAN OPLINGER on fri 12 apr 02
Hello Martin,
I have not seen your original post in its entirety, so I may be responding
out of context to Bruce's reply to you.
With some white grogged stoneware clay I've been using recently, if I want a
smooth, satiny finish, I will first prepare slip that has the grog removed
by settling. Then I wait for the pot to dry to a soft leather hard, then
smooth the surface with a flexible stainless steel rib. This compresses
grog particles into the clay. I then let the pot dry almost completely, and
brush on three or four layers of the slip, wait for it to harden a bit then
smooth the slipped surface again with the stainless rib. Finally, I burnish
the surface with a piece of polished stone or glass. When the pot is bisque
fired, It will lose its shine, but have a very smooth even satiny surface.
I have not yet tried applying the 'terra sig' to the bisqued surface yet.
That is the next step into my exploration.
Regards,
Logan Oplinger
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Snail Scott on fri 12 apr 02
At 11:52 AM 4/10/02 -0500, Martin Rice wrote:
>...I never burnished these pieces when the
>time was right...
But bone-dry burnishing works great! Just wipe the
clay with mineral oil, baby oil, lard, or any other
handy greasy stuff. (Some people alternate oil and
water.) Then burnish with a smooth rock or spoon.
Note that the clay has to have been smoothed already.
Burnishing will shine a smooth surface, but will not
flatten out bumps. (You can sand the bumps out,
though, before burnishing.)
-Snail
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