[Clayart] Wide range clay

Joseph Herbert josephherbert827 at gmail.com
Sat Jan 22 20:48:05 UTC 2022


Hello,

As far as the “completely vitrified” question goes, remember some
dinnerware is bisque fired to the highest cone while being supported by a
sand mold to prevent collapse. All glaze and decorations are lower fired
step by step. That kind of ware is probably completely vitrified.

Absent X-ray diffraction studies to determine a estimate of remaining
crystalline particles, fracture patterns could hint at vitrification level.
A completely glassy object should exhibit conchoidal (curved) fracture; a
less glassy object should exhibit a rougher fracture surface.

Master’s degree topic for someone, not me!

Encouraging everyone to do fracture studies, especially with work you don’t
like.

Joe

PS

I would not discount the possibility of a clay body retaining (or
generating) enough crystal character to prevent collapse while still
allowing enough melting to fill pores. Clearly, the shape of the object is
important but glasses can be extremely viscous even at elevated
temperature.

J
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