Brad Sondahl on thu 24 jan 02
Typically either a mechanical defloculent such as Bentonite is added in
small percentages (1-2%), or a salt based one such as Epsom Salts. If
your glaze is gelling, you definitely do not want the Bentonite, as it
suspends by partially gelling.
From my pottery tips page: "Epsom Salts solution: by volume 3 parts hot
water (helps dissolve) to one part Epsom Salts (available drug and
grocery
stores cheaper than pottery suppliers.), Add 1 1/2 cups of Epsom Salt
solution to 4 gallon batch of glaze.. "
So you might try that.
Brad Sondahl
--
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Lamar, Luke on thu 24 jan 02
Brad Sondahl said:
>Typically either a mechanical defloculent such as Bentonite is added in
>small percentages (1-2%), or a salt based one such as Epsom Salts. If
>your glaze is gelling, you definitely do not want the Bentonite, as it
>suspends by partially gelling.
I read somewhere (maybe this list :-)) that Epsom Salts can make a clear
glaze cloudy or less shiny. Will Bentonite do the same thing?
Luke Lamar
llamar@bacweb.org
Jeff Tsai on tue 29 jan 02
Heya,
Thought I'd just tag on the note about ball milling that most of you know
anyway. Usually great for helping suspension if done for an hour or so. But
don't make my mistake a few years back and leave the thing going for several
hours...changed the melting temperature of the glaze and, to a lesser extent,
the surface of the glaze.
-jeff
iandol on wed 30 jan 02
Dear Jeff Tsai=20
I have always considered ball milling to be a form of accelerated =
weathering which degrades the chemical composition of some minerals, =
especially the Felspars which leads to the depletion of sodium and =
potassium ions from those materials.
Best regards,
Ivor Lewis
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