fake ash glazes

updated tue 12 nov 02

Sue Warrington on thu 8 may 97

A friend without a computer is doing a research project on fake ash glazes.
Does anyone have any recipes they could let her have cone 8-10.
Unfortunately we do not have Albany or Bernard slip in West Australia.
Thanks Sue Warrington
sujon@wantree.com.au.

Doug Gray on fri 9 may 97

Sue,

Try experimenting with glazes that contain a high content of Calcium
Carbonate (Whiting), or try adjusting the level of whiting in some of
you existing glazes. It helps produce the glaze runs associated with
ash.

Doug Gray
Alpine, TX

Grimmer on sat 10 may 97

Hi,
My favorite fake ash is called 'Hannah Fake Ash,' though I don't know
the origin. Great in ^10 Reduction, salt/soda, wood, etc. It looks like what all
the 'old guys' (sorry!) say Lorio's Ash looked before the Albany Slip went
south and people used hard brick kilns and fired slow and so forth.
I love it. Anyroad...

Hanna's Fake Ash ^10R
30 Whiting
10 Strontium
60 Redart
4 Yellow Ochre

You probably don't have Redart in Australia, either. Do a triaxial blend with
any red clay, and two alkaline earth (Ca, Ba, Li, Sr, Mg) providers. You
will be surprised at all the glazes you find! Don't need a computer, either.
Good luck!

steve grimmer
carterville illinois
grimmer@mychoice.net

Craig Martell on sat 10 may 97

At 08:53 AM 5/8/97 EDT, Sue Warrington wrote:
>----------------------------Original message----------------------------
>A friend without a computer is doing a research project on fake ash glazes.
>Does anyone have any recipes they could let her have cone 8-10.
>Unfortunately we do not have Albany or Bernard slip in West Australia.
>Thanks Sue Warrington
>sujon@wantree.com.au.


Hi Sue:

Here's one that I formulated and have used for a number of years. It is
best applied by spraying but can be dipped, poured, etc. You have to work
with the thickness to got the desired result. A light application will
"orange peel" like a salt glaze while heavier applications will run. Too
much thickness and you will get blistering. This glaze works well with most
oxides. It also works best on porcelain or with white slips but don't be
afraid to try anything...you never know. You can get this glaze to work at
cone 8 and 9 by substituting Ball Clay for Kaolin. You might want to do a
sub at cone 10 as well to observe the difference.

Fake ash glaze Cone 10 Ox. or Red.

Dolomite 8.0% by weight
Whiting 34.0
Potash Feldspar 5.0
Kaolin 33.0
Silica 20.0

Regards, Craig Martell-Oregon

Bobbruch1@AOL.COM on sat 9 nov 02

<<<<pottery at cone 6 elec. and keep getting a mess!!! I see people with
beautiful pots with fake ash that seems to be very much under control. When
I ask how it's done I never get an answer, a lot of talk but not a real
answer. I have tried about every recipe I can find, sprayed, brushed and
dipped all yield about the same results. (grinding kiln shelves)

Assume that you mean that you are not able to achieve the runny quality on
your tests? Or are they running too much? If it is the former, then it could
be the claybody you are using. I have tested some fake ash glazes that look
great on porcelain but just do nothing on stoneware. Also, why not try the
real thing, and use actual ash glazes. There are many formulas for both cone
6 & 10 in both reduction and oxidation in the archives and in various books
on the subject.

Also, you need to put something under the pieces (including test tiles) to
avoid the need for grinding shelves. Softbrick is one possibility.

Bob Bruch