SilverNightstar * on sat 21 jul 01
I found some metallic glazes that I wanted to use, but I am not familiar
with what they cone at. The catalog say that they cone at 018 and for the
bright Gold 017. What is the tempture for this cone? At this point I don't
have a kiln and have someone else fire my peices and need to know this info
to give her and for my own future reference. Any help would be appricated
as well as any other information on metallic glazes.
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Snail Scott on sun 22 jul 01
At 07:13 PM 7/21/01 -0500, you wrote:
>I found some metallic glazes that I wanted to use, but I am not familiar
>with what they cone at. The catalog say that they cone at 018 and for the
>bright Gold 017. What is the tempture for this cone? At this point I don't
>have a kiln and have someone else fire my peices and need to know this info
>to give her and for my own future reference. Any help would be appricated
>as well as any other information on metallic glazes.
These are overglazes, and must be applied over a fired
glaze. (Any temperature glaze will do.) Shiny glazes
will give a shiny appearance to the overglaze; matt
glazes will make the overglaze look matt, too.
Cones (usually written as ^ when typing) are little
manufactured bars of clay (often cone-shaped) for
determining the amount of heat in a kiln, and the
effect it's having on your clay inside.
^018 is around 1280-1320 degrees F depending on the
speed of the firing. ^017 is around 1340-1370. (The
faster the firing, the higher the temperature needed
to be equivalent to a given cone.)
It's better to go by cones rather that temperatures;
it's more accurate. If your friend has a kiln with
only a pyrometer, use the lower temperatures that I
mentioned above. (It's better to underfire than to
overfire.) Most kilns are set up to use cones, though,
so use them if possible.
-Snail
Wade Blocker on sun 22 jul 01
Are you referring to brushed on lusters or glaze formulas which give a
metallic look? Mia in ABQ
SilverNightstar * on sun 22 jul 01
Actually both, any information on them would help. I have a few orders for
some pieces done in metallic and I am not sure about them as I have never
used them before. Like for instance what they cone at, which you all have
answered for me, and can you use them on pieces that are used for food or
drink? This and any other information would really help out a lot.
Thanks
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Penny Hosler on mon 23 jul 01
You can also go to the Orton cone web site and download a temperature
equivalent chart, for future reference:
http://www.ortonceramic.com/center/cone_ref.html
Penny in WA
-----------------------------------
> I found some metallic glazes that I wanted to use, but I am not familiar
> with what they cone at. The catalog say that they cone at 018 and for the
> bright Gold 017. What is the tempture for this cone? At this point I
don't
> have a kiln and have someone else fire my peices and need to know this
info
> to give her and for my own future reference. Any help would be appricated
> as well as any other information on metallic glazes.
>
Wade Blocker on mon 23 jul 01
Luster glazes and glazes that result in a metallic sheen are not food safe.
The latter because of the high percentage of manganese and other oxides in
the glaze would leach out when used for food purposes. The luster glazes
are not durable for everyday use. Mia in ABQ
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