[Clayart] Bill Carty and pinholing
p.hamer at btinternet.com
Mon Mar 10 11:04:17 EDT 2014
Re-postingof the 10th message in
Dr. William Carty at Alfred claims firing
dehydroxylates kaolin (drives the water off it). As a
result, he says, the fired surface of the clay is
somewhat hydrophobic (repels water). Dipping the ware
in water, sponging it, etc permits the clay to attach
itself to some water (rehydroxylates the clay) and
renders the surface hydrophyllic again (attracts
water). As a result, the surface is less prone to
I do not know whether his statements are accurate.
I have never read this in the published literature.
I have not tested it personally. There are other
variables, like glaze composition, surface roughness
of the ware, dust, etc. which would make a test
difficult. I have found Carty to be a credible source
of such information, given that his Ph.D. is in
surface chemistry and he has worked quite a bit with
clay products, but I'm biased because he was my MS
Presumably adding a surfactant (e.g. 1 drop of dishwasher rinse aid) would assist this process;
either to the wash-water or the glaze bucket.
From: Vince Pitelka <vpitelka at dtccom.net>
To: 'Clayart posting' <clayart at lists.clayartworld.com>
Sent: Monday, 10 March 2014, 13:46
Subject: Re: [Clayart] tony's metaphor tangent - cornwall stone vs custer, mega-pinholes
Taylor Hendrix wrote:
"Eddy, heard a very interesting lecture by a ceramics engineer from Alfred,
Bill Carty. An interesting take away was his finding for the underlying
cause of pinholes. Not outgassing, not dirty bisque. Interesting."
Yes . . . go on . . .
Appalachian Center for Craft
Tennessee Tech University
vpitelka at dtccom.net
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