Dave Finkelnburg on wed 19 dec 01
Hi all!
I am prompted to write in reply to Chris Schafale's remark today that
crazing is a glaze "fault." I would not disagree, and have a lot of respect
for Chris' artistic talents. However, some folks like the look of crazing
on some ware, especially where they have become accustomed to crazing. On
some ash glazed and wood-fired work, and many historic Chinese pieces, for
example, crazing is a usual feature of the fired glaze.
Would it be acceptable to simply say, it is a fault when a glaze crazes
when you don't want it to and don't intend for it to craze?
Respectfully,
Dave Finkelnburg
John Hesselberth on wed 19 dec 01
on 12/19/01 2:22 PM, Dave Finkelnburg at dfinkelnburg@CABLEONE.NET wrote:
> I am prompted to write in reply to Chris Schafale's remark today that
> crazing is a glaze "fault." I would not disagree, and have a lot of respect
> for Chris' artistic talents. However, some folks like the look of crazing
> on some ware, especially where they have become accustomed to crazing. On
> some ash glazed and wood-fired work, and many historic Chinese pieces, for
> example, crazing is a usual feature of the fired glaze.
> Would it be acceptable to simply say, it is a fault whe
Hi Dave,
While crazing certainly can be used effectively in a decorative sense, it
produces at least one "defect" that has to be called just that--a defect or
fault. When a glaze crazes it initiates a tiny crack in the clay substrate
to which the glaze is bonded. In that wonderful book "Pioneer Pottery",
Michael Cardew (one of my heroes) reports the result of an experiment where
the breaking strength of porcelain was measured with 1) a crazed glaze 2) no
glaze and 3) a well fitting glaze. The ratio of breaking strengths was
measured as 40:100:160 respectively, i.e. the strength of the porcelain was
improved some 60% by a well fitting glaze and weakened some 60% by a crazed
glaze. Another way of saying this is that the well fitting glazed piece was
4 times as strong as the crazed piece. I think that is a defect or "fault"
by most anyone's definition. On functional work I think a strength loss of
this magnitude would be very undesirable.
Regards,
John
Web sites: http://www.masteringglazes.com and http://www.frogpondpottery.com
Email: john@frogpondpottery.com
"The life so short, the craft so long to learn." Chaucer's translation of
Hippocrates, 5th cent. B.C.
Christena Schafale on thu 20 dec 01
Hi Dave,
I'll heartily agree with that. What I thought I said (what I was trying to
say) is that, for me, on functional ware, I consider crazing a
fault. Others may have other standards and choices, and I respect that.
Chris Schafale
who participated in her very first raku firing a couple of weeks ago, and
has fallen for white crackle -- talk about non-functional! but oooo, pretty!
At 12:22 PM 12/19/01 -0700, you wrote:
>Hi all!
> I am prompted to write in reply to Chris Schafale's remark today that
>crazing is a glaze "fault." I would not disagree, and have a lot of respect
>for Chris' artistic talents. However, some folks like the look of crazing
>on some ware, especially where they have become accustomed to crazing. On
>some ash glazed and wood-fired work, and many historic Chinese pieces, for
>example, crazing is a usual feature of the fired glaze.
> Would it be acceptable to simply say, it is a fault when a glaze crazes
>when you don't want it to and don't intend for it to craze?
> Respectfully,
> Dave Finkelnburg
>
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