Jonathan Kaplan on thu 16 may 96
As a sidebar, one of my clients has had a myriad of problems, specifically
pin holing in his cone 5 glaze. Nothing he was able to "correct" rectified
the problem.
I replaced the whiting in the glaze with wollastonite, which eliminated the
carbonate out gassing from the whiting. Wollastonite, a calcium silicate,
solved the problem. Using my Insight program, I was able to maintain the
same alumina silica ratio of the glaze and kept all parts in balance by
adjusting the other contributors of SiO2 to the glaze.
My client is happy. No glaze problems. And, nada pin holing whatsoever.
I offer this as an example for a few reasons. First, it is possible to
work with a glaze and armed with information, make changes, and second, to
illustrate the versitility of the Insight program with a simple task such
as this. Great piece of software. Thanks Tony!
Also, I might recommend 'Out of the Earth ...into the Fire" from the
American Ceramic Society. Fabulous book. An excellent addition to your
reference materials.
Jonathan
Jonathan Kaplan
http://www.craftweb.com/org/jkaplan/cdg.shtml
(aka "Scooter)
jonathan@csn.net
Ceramic Design Group Ltd./Production Services Voice:
970-879-9139 POB 775112
FAXmodem: same
Steamboat Springs, Colorado 80477, USA CALL before faxing
"No matter where you go, there you are!"
Tom Buck on thu 16 may 96
Jonathan K: Thanks for the good advice on carbonates as glaze
trouble-makers. Most of the complaints that appear on Clayart (and like
you I have used Insight to adjust them) are the direct result of
too much carbonate(s) in the glaze mix. And yes, Wollastonite and Talc
together if the Cone is right will end the outgassing and therefore the
pinholing, etc.
You give thanks to Tony Hansen for inventing Insight, and I
certainly agree with that. As an early disciple, I endorse your support
and all PC DOS/Windows people should too. Besides, Tony Hansen just keeps
working at making ceramic science available to the average potter, cf his
latest offer, an electronic form of his book "Magic of Fire II" sent to
anyone for viewing before buying. Interested people may find more at his
website: http://www.memlane.com/business/imc/imc/html
Regards TomBuck Hamilton Canada
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