William Lucius on thu 18 jun 09
My otherwise acceptable ISP spell checker does not work with my current =3D
version of Microsoft Office. Sorry about any spelling errors
William A. Lucius
Board President and Director
Institute for Archaeological Ceramic Research (IACR)
iacr@msn.com
www.instituteforceramicarchaeology.org=3D
aeology.org/>
ourlkcpage.multiply.com
www.leuppkilnconference.org
----- Original Message -----=3D20
From: William Lucius=3D20
To: listserv@lsv.ceramics.org=3D20
Sent: Thursday, June 18, 2009 10:39 AM
Subject: re: Converting a cone 6 glaze to a cone 5 1/2
I had a similar issue with a temmoku glaze that was formulated to mature =
=3D
at Cone 6, a temperature at which many of my native clays begin to bloat =
=3D
and/or liquefy. Replacing the feldspar with nepheline syenite (which =3D
enters into the melt at a lower temperature) effectively reduced the =3D
maturation of the glaze one cone. See pp. 332:
=3D20
Peterson Susan
1992 The Craft and Art of Clay, Prentice Hall, Englewood Cliffs=3D20
=3D20
In an ideal world, replacing 1/2 of the feldspar with nepheline syenite =3D
should reduce the cone by 1/2. This of course assumes a linear =3D
relationship, which may be incorrect.
William A. Lucius
Board President and Director
Institute for Archaeological Ceramic Research (IACR)
iacr@msn.com=3D20
www.instituteforceramicarchaeology.org=3D
aeology.org/>
ourlkcpage.multiply.com
www.leuppkilnconference.org
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