Doug Kassebaum on wed 8 oct 97
Kathy - Just coming in late on the thread...
Ron and Vince are right on the money on your black coring. Death
Valley Red does have iron in it and it needs to be treated with
respect through the critical 700 - 900 C (1300-1650 F) range. This
is consistent with the 40+ years history this body has seen in
commercial production and cone 10 reduction firings.
It would be great to be able to use high iron bodies to cone 10 for
the exciting colors we might acheive, but as Ron correctly points
out, no one can afford to "formulate a clay body made for
reduction that did not function under full reduction."
If you would like to contact us at Laguna with any questions, you can
reach us at:
(800) 452-4862
steve@lagunaclay.com - Lab manager
techny@lagunaclay.com - Miller clay technical help
Better late that never?
>I have had this happen with Laguna Death Valley from time to time and
>it quite seriously impacts on the fired strength of the clay.
>
>Some clays can handle heavy reduction much better than others
>I don't know what the factors are that contribute to this
>but the amount of iron in the clay must definitely be one of
>the important ones.
>
>
>so...imho...yes clays can be overreduced...especially during the body
>reduction phase of firing.
>Kathy
Doug Kassebaum,
Laguna Clay Co., New York
(315) 685-8378
doug@lagunaclay.com
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