Jim Mahoney on thu 10 oct 02
When firing a stack of tiles(one resting directly on the one below it so
as to form a solid block of dried clay), to cone 02, I discovered that
those tiles in the center of the stack had dark 'burns' or stains in
there center in a random pattern. The 2 tiles on top and the bottom did
NOT have these stains. The stack sat directly on a shelf, so the bottom
was, in a sense, not exposed to air.
Question: Is this stain due to heat buildup within the mass of clay or
due to some stain in the clay that is used to make it a light red?
Question: Is there a higher temp in the center of this stack of tiles
due to the way they are stacked?
Thanks,
Jim Mahoney
can be reached off-list at JFMAH @JUNO.COM
________________________________________________________________
GET INTERNET ACCESS FROM JUNO!
Juno offers FREE or PREMIUM Internet access for less!
Join Juno today! For your FREE software, visit:
http://dl.www.juno.com/get/web/.
Alistair Gillies on thu 10 oct 02
Hi,
The mottled and uneven colouring in the centre of your tiles is due to
the lack of air flow in the stack, leading to the uneven venting of
gasses from the tiles.
I personally think that this is an asset on a plain tile and have just
laid a floor from Ruabon Tiles - a North Wales tile maker with a great
seam of clay. Ruabon purposely stack about 10 tiles together on their
sides in order to get this effect.
If you want a plain colour then separate the tiles.
All the best,
Alistair Gillies
Shropshire, England.
leaves turning, beginning autumn, in fact the tiles that I have used are
called Autumn.
>When firing a stack of tiles(one resting directly on the one below it so
>as to form a solid block of dried clay), to cone 02, I discovered that
>those tiles in the center of the stack had dark 'burns' or stains in
>there center in a random pattern. The 2 tiles on top and the bottom did
>NOT have these stains. The stack sat directly on a shelf, so the bottom
>was, in a sense, not exposed to air.
>
>Question: Is this stain due to heat buildup within the mass of clay or
>due to some stain in the clay that is used to make it a light red?
>
>Question: Is there a higher temp in the center of this stack of tiles
>due to the way they are stacked?
>
>Thanks,
>Jim Mahoney
Marcia Selsor on thu 10 oct 02
The coloration is more of a local reduction due to no air. It is from
whatever was burning out of the clay body. To avoid in the future you
could try sticking a few little coils between the tiles. I extruded a
mess 'o coils with a steel screen as a die. Distrubte randomly over each
tile. They will let the gases escape.
marcia in Montana
Jim Mahoney wrote:
> When firing a stack of tiles(one resting directly on the one below it so
> as to form a solid block of dried clay), to cone 02, I discovered that
> those tiles in the center of the stack had dark 'burns' or stains in
> there center in a random pattern. The 2 tiles on top and the bottom did
> NOT have these stains. The stack sat directly on a shelf, so the bottom
> was, in a sense, not exposed to air.
>
> Question: Is this stain due to heat buildup within the mass of clay or
> due to some stain in the clay that is used to make it a light red?
>
> Question: Is there a higher temp in the center of this stack of tiles
> due to the way they are stacked?
>
> Thanks,
> Jim Mahoney
> can be reached off-list at JFMAH @JUNO.COM
>
> ________________________________________________________________
> GET INTERNET ACCESS FROM JUNO!
> Juno offers FREE or PREMIUM Internet access for less!
> Join Juno today! For your FREE software, visit:
> http://dl.www.juno.com/get/web/.
>
> ______________________________________________________________________________
> 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
| |
|
