george koller on sat 15 feb 03
Greetings glaze gurus,
I'm trying to help make bid estimates and understand
considerations for a large outdoor tile project in a sunny
foreign land. The project is wide open, we are considering
everything from low fire to cone 10 reduction. What I'm
wondering is if there are any general considerations for
glaze appearance stability for genuine "metal based" colors
such as cobalt, nickel, chromium, iron and so on. Can we
guarantee that they will not fade in 5 or 10 years?
Thank you,
george koller
sturgeon bay, wi - door county
Dave Finkelnburg on sat 15 feb 03
Dear George,
I was marveling, early last fall, at some gorgeous tile murals in the
Forbidden City in Beijing, P.R. China. The bright greens and yellows, in
particular, were stunning. These were on a south-facing wall in full sun,
and were tiles made several hundred years ago. Except for some recent
restoration, the last work is around 300 years old, some more than 600 years
old.
So yes, you can guarantee glaze colors will not fade in 10 or 15 years
IF the metals are encapsulated in some good glass. How you make the good
glass is hard to say...there are many ways to get there.
Low fire should be perfectly adequate and much less energy-expensive, if
you properly formulate clay body and glaze. In general, oxidation firing
removes one troublesome variable that affects glaze color. That can be
important for a large project where you want the same color from many
firings.
Good luck!
Dave Finkelnburg in Idaho
----- Original Message -----
From: "george koller"
> I'm trying to help make bid estimates and understand
> considerations for a large outdoor tile project in a sunny
> foreign land. The project is wide open, we are considering
> everything from low fire to cone 10 reduction. What I'm
> wondering is if there are any general considerations for
> glaze appearance stability for genuine "metal based" colors
> such as cobalt, nickel, chromium, iron and so on. Can we
> guarantee that they will not fade in 5 or 10 years?
Ilene Mahler on sat 15 feb 03
Paul Lewing is the guru of painting on tiles with glazes etc..He gave an
amazing demo at the convention last year..Someone on the list may have his
e-mail..or Paul may give you the info. you need... Ilene in freezing Conn
wishing tomorrow was the convention Warm Sunny Southern Calif......
----- Original Message -----
From: "george koller"
To:
Sent: Saturday, February 15, 2003 4:13 AM
Subject: UV considerations for Glazes?
> Greetings glaze gurus,
>
> I'm trying to help make bid estimates and understand
> considerations for a large outdoor tile project in a sunny
> foreign land. The project is wide open, we are considering
> everything from low fire to cone 10 reduction. What I'm
> wondering is if there are any general considerations for
> glaze appearance stability for genuine "metal based" colors
> such as cobalt, nickel, chromium, iron and so on. Can we
> guarantee that they will not fade in 5 or 10 years?
>
>
> Thank you,
>
> george koller
> sturgeon bay, wi - door county
>
>
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iandol on sun 16 feb 03
Dear George Koller,=20
I suggest you contact the Iraq Potters Association, Baghdad, Iraq. They =
have examples of tiles which go back several centuries. Exposed to =
constant sunlight. Some of the finest ceramic art ever made. The Chinese =
even cribbed their Calligraphy for the benefit of the Emperor.
What a pity the Vandals of this World are intent on destroying that =
heritage.
Best regards,
Ivor Lewis
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