terryh on mon 22 dec 97
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i have been experimenting (trying) several versions of cracle celadon =
glazes. i
got celadon color right, (though i like greener better on crackled, not as =
pale
blue on uncrackled) and i got crackles right. except crackles were too fine =
(too
tight) crackles. am i firing and cooling too fast? or, should i look for a
better recipe? could anyone share his/her experience of crackle celadon
glaze/firing? thanx. terry
terry hagiwara e-mail: thagiwara=40halnet.com (W)=3B terryh=40pdq.net =
(H)
web: http://www.geocities.com/SoHo/Cafe/3755
Craig Martell on wed 24 dec 97
At 11:18 AM 12/22/97 EST, you wrote:
>----------------------------Original message----------------------------
>-------------------
>i have been experimenting (trying) several versions of cracle celadon glazes. i
>got celadon color right, (though i like greener better on crackled, not as pale
>blue on uncrackled) and i got crackles right. except crackles were too fine
>(too tight) crackles.
Hi:
Very fine craze or crackle lines indicate that the glaze and body are pretty
far off in regard to expansion. To make the crackle lines coarser or
larger, one must lower the expansion of the glaze. I would start by adding
silica in increments of not more than 5%. One could also look at lowering
the high expansion materials in the glaze, such as feldspar, which contains
potassium and sodium which are high expansion. You could also look at
adding some lower expansion fluxes such as magnesia, but be advised that
this will alter the color response of the glaze. The silica approach would
be the least likely to alter the aesthetic properties of the glaze.
Feliz Navidad y Prospero Ano Nuevo, Craig Martell-Oregon, whose computer
will not do tildes.
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