Bill Edwards on tue 12 nov 02
Hi,
Its good to see Alisa here once again. In the past I
was lucky enough to have seen the zest and energy she
put into testing glazes. This is a great dedication on
her behalf and one that is welcomed since its so hard
for most people to get tests out as fast. It broadens
our education Alisa and thank you for doing it!
I would assume the lithia in the glaze is the
contributing factor to such shifts in color. Being its
a flux used often in combination with coloring oxides
to highten and brighten the effects of said color at
low amounts in low Al203 and high alkyline glazes.
I would be curious to know what the glaze would look
like with the rutile taken out and replaced with TiO2
and a reduction of copper by 1% and replacing that
with cobalt carbonate. Yes it is a high Al203 and low
calcium glaze as it stands. I wouldn't suggest its
stability for any food bearing surface but on the
right pieces I bet it would be a very pleasing glaze
to the eye.
The changes on coloring oxides are in captions below.
From: Alisa Liskin Clausen
Subject: Phila Green Phila Pink
Dear Clayart,
I tested this recipe a while a go when it was posted
to the list.
Phila Green, redux. cone 6
58 Neph. Sye.
26 Strontium Carb.
10 Ball Clay
5 Silica
1 Lithium Carb.
4 Rutile (4.00 TiO2)
4 Copper carb. (3.00 Copper + 1.00 Cobalt Carb.)
4 Bentonite
1 Epsom salt.
Bill Edwards
=====
http://www.tallapoosariverpottery.com/
Bill Edwards
PO Box 267
Lafayette, AL, 36862
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Alisa Liskin Clausen on wed 13 nov 02
Dear Will,
Likewise.
Thank you for the comments on this temperamental glaze.
I have a lot on the slab now for the glaze test firing. I just have a lot
of other things to get glazed now, up to Christmas. On one hand I miss the
test tiles to look at, but on the other, I am turning over glaze kilns so
quickly now, that I do not take the time to put mix up the tests, all
waiting patiently in their plastic conical houses.
However, I will get them out soon.
I am trying a whole range of semi mattes and whites with oxides painting
underneath so I can compare them for a base to go over all the oxide
brushing I am doing at the moment. I am painting on oxides, brushing them
off and getting some very nice outlines and brush marks of the strokes.
Interesting and painterly.
I need a base to go over them that is not too shiny, but not so matte that
it is too opaque. The challenge!
So, otherwise, business is booming (for my standard) for these two short
months, so I have to make the best of selling right now, before the dark,
low period again ahead from January.
Hang in there Clayarters who are interested in cone 6 test results, they
will roll down your screen in the near future.
regards from Alisa in Denmark
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