Jeff Lawrence on fri 6 dec 96
Hello Everyone!
I've been stalking the perfect ^04 mat for my fixtures and have stumbled
over a phenomenon that I can't find diagnosed in my library. Hope somebody
out there can confirm or disprove my hypothesis.
The glaze is a high-expansion glaze with way too many ingredients and 7% by
dry weight Bayer GS-514 Chrome-Iron terra cotta stain. Whether thick or
thin, the surface is a good almost dead mat. However, the glaze runs in a
funny way, creating wrinkles on the surface. Like cake frosting, the surface
seems drier than the underlying layer slides down on vertical surfaces. Even
on horizontal surfaces, it wrinkles up on the edges of my test tiles.
My troubled hypothesis:
The glaze is hardening on the outer layer before the lower layer does and
that its hardening is accompanied by a significant contraction.
Trouble with the hypothesis:
If the contraction is so great that it makes obvious wrinkles, why doesn't
the glaze jump right off the pot?
Please bend your brains to this for me. Thanks in advance!
Jeff Lawrence
Sun Dagger Design
Rt 1 Box 394L
Espanola NM 87532
ph/fax 505-753-5913
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