Lily Krakowski on sun 10 nov 02
June, I am sorry, I remain in the dark. Your web site is lovely and the
glaze samples lovely, the work you did amazing, and thank you for leading me
to them.
However the Fake Ash Glaze is a plain calcium borate glaze and what I do not
understand is that wood ash has no boron that I know of, and lots of soda
and potash and such and I am confused what constitutes a fake wood ash
glaze.
Leach quotes K Pleydell-Bouverie's analyses of diverse ashes and they are
high in silica, sometimes in alumina, all contain lots of lime, and diverse
amounts of potash and phosphorus. Magnesium seems to be a small
constituent, and boron is not there at all.
So what am I (obviously) missing? Are fake ash glazes simply glazes that
look as though they might be ash/
Lili Krakowski
P.O. Box #1
Constableville, N.Y.
(315) 942-5916/ 397-2389
Be of good courage....
Elca Branman on sun 10 nov 02
If we ponder long enough, we answer our own questions.
Elca
On Sun, 10 Nov 2002 12:55:38 -0500 Lily Krakowski
writes:
> So what am I (obviously) missing? Are fake ash glazes simply glazes
> that
> look as though they might be ash/
>
>
>
>
> Lili Krakowski
> P.O. Box #1
> Constableville, N.Y.
> (315) 942-5916/ 397-2389
>
> Be of good courage....
>
>
_________________________________________________________________________
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> melpots@pclink.com.
>
>
Elca Branman,in Sarasota Florida
elcab1@juno.com
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Lily Krakowski on sun 10 nov 02
You are right, but I was pondering what the COMPOSITION of fake ash was. As
Pleydell Bouverie analyzed wood ashes, and I know I have seen such analyses
elsewhere than Leach as well, I thought there were some phony ash recipes
out there. If it is only look alike--ah well, I did answer my own question.
Elca Branman writes:
> If we ponder long enough, we answer our own questions.
>
> Elca
> On Sun, 10 Nov 2002 12:55:38 -0500 Lily Krakowski
> writes:
>
>> So what am I (obviously) missing? Are fake ash glazes simply glazes
>> that
>> look as though they might be ash/
>>
>>
>>
>>
>> Lili Krakowski
>> P.O. Box #1
>> Constableville, N.Y.
>> (315) 942-5916/ 397-2389
>>
>> Be of good courage....
>>
>>
> _________________________________________________________________________
> _____
>> Send postings to clayart@lsv.ceramics.org
>>
>> You may look at the archives for the list or change your
>> subscription
>> settings from http://www.ceramics.org/clayart/
>>
>> Moderator of the list is Mel Jacobson who may be reached at
>> melpots@pclink.com.
>>
>>
>
>
> Elca Branman,in Sarasota Florida
> elcab1@juno.com
>
> ________________________________________________________________
> Sign Up for Juno Platinum Internet Access Today
> Only $9.95 per month!
> Visit www.juno.com
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
Lili Krakowski
P.O. Box #1
Constableville, N.Y.
(315) 942-5916/ 397-2389
Be of good courage....
Wes Rolley on sun 10 nov 02
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At 12:55 PM 11/10/02 -0500, you wrote:_________________________
>So what am I (obviously) missing? Are fake ash glazes simply glazes that
>look as though they might be ash/
The best source that I have found for a discussion of ash glazes,=20
"resonstituted ash" glazes and "fake" ash glazes is Phil Roger's book,=20
entitled just "ash glazes".
For a reconstituted ash glaze, Rogers took the chemical analysis of a=20
particular ash and worked back to produce a mixture of materials that would=
=20
approximate the ash itself. For example according to Rogers, Leach's=20
analysis for rice straw ash can be reconstituted as follows:
China Clay 20
Dolomite 3.5
Talc 13
Quartz 56.75
Potassium carbonate 2
Bone Ash 2
FeO 2
For "fake ash" he gives a recipe from Tom Turner using Albany Slip. This=20
acts like an ash glaze on the pot, runs and all.
Since there are so many "ash glazes" that with a wide variety of=20
color/texture appearances, it is rather hard to know what one is talking=20
about when one says an ash glaze unless you mean that it has runs, drips,=
etc.
Again, while most hardwood ash has fairly high calcia content, as mentioned=
=20
here, that could range from 60% for apple ash to 20% for willow which is=20
almost half Potash K2O. Straw, fern, grass, hay, etc. may have very little=
=20
calcia and lots of silica.
"I find I have a great lot to learn =96 or unlearn. I seem to know far too=
=20
much and this knowledge obscures the really significant facts, but I am=20
getting on." -- Charles Rennie Mackintosh
Wesley C. Rolley
17211 Quail Court
Morgan Hill, CA 95037
wrolley@charter.net
(408)778-3024
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