[Clayart] Fw: Blue haze on kiln shelves mystery

[David Woof]

Hi Ron, Lisa,
Yes I agree with what you said regarding the MgO.
Because you had stated that you had run Lisa's glaze thru the Insight program, I was counting on you to assist Lisa in re-formulation of a glaze adjusted from the Gillespie to a Boron Frit such as 3134 or 3124 or possibly 3195 etc. depending on the other glaze material constituents because you had access to her original recipe, and I no longer do.
One could also scrap the whole existing glaze and start over building a new glaze around a Boron Frit.
(Exciting and learning prospect...!!!...???)

Of course, it all depends on what you, Lisa, wish to do.
And that you two can work it out provided both parties are willing.

P.S. Ron,
other than that I prefer a deflocculation method for glaze slop suspension in most glazing applications, and you favor Flocculation for most of same....I believe we see eye to eye on most other Ceramic issues.
Especially that for many years we have beat the same drum regarding the science and ethics of creating stable glazes for vessels of Domestic Utility.
Live long and be well my friend....... Love, David

Misneach,
David Woof...............................................................................................................................
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From: ronroy at ca.inter.net <ronroy at ca.inter.net>
Sent: Tuesday, November 8, 2022 10:46 AM
To: Clayart international pottery discussion forum <clayart at lists.clayartworld.com>; David Woof <woofpots at hotmail.com>
Subject: Re: [Clayart] Blue haze on kiln shelves mystery

Hi David,

I don't think that will work. The expansion goes up because the MgO
goes down a lot and - the Gillespie borate helps float the glaze in
the bucket.

MgO is magnesium oxide and it has a low expansion rate so it's a good
anti craze.

The Gillespie borate, which is a good replacement for Gerstley borate
is hydroscopic and helps keep glazes in suspension.

The alumina stays the same in each case so adding clay to help the
suspension issue would change the glaze.

RR



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