Jonathan Kirkendall on sun 27 feb 05
Hello all,
Pulled some interesting tests out of the kiln and wanted to report...
Like Alisa, I have been moving more and more towards textured glazes,
and have found Brian Gartside's work extremely helpful in terms of
establishing a baseline from which to work. The following tests (except
for the last) were all inspired by the success of one test from another
line of experiments, which was ash, blackbird clay, and magnesium carb
mixed in equal parts. This glaze came out looking interestingly bark
like - exactly what I've been going for.
I took the ash/blackbird mix and added different ingredients as the
third. The resulting glazes were much more like what we generally think
of glazes - melted, smooth, some were glassy - and not the texture that
I was looking for, but I will take these results and keep moving
forward, probably adding some mag carb to them to see what happens.
I fire to Cone 6 using John Hesselberth's suggested firing schedule:
100 F to 220 F
350 F to 2000 F
108 F to 2185 F
Hold 18 minutes
500 F to 1900 F
Hold 10 minutes
125 F to 1400 F
off
The following glazes are measured in parts, and have not been tested for
durability or safety.
1:1:1 ash, blackbird clay, and frit 3195: semi matt clear amber, pools
nicely, very runny, smooth covering
1:1:1 ash, blackbird clay, and soda spar: waxy, dense dark brown, little
movement of the glaze
1:1:1 ash, blackbird clay, and spodument: dark brown background, light
brown rivulets on top, much visual texture, well melted, a little running
1:1:1 ash, blackbird clay, and petalite: matt, more reddish brown than
with the spod, overall covering is matt and smooth but two drips are
shiny, dark brown. Nice feel - smooth and buttery
1:1:1 ash, blackbird clay, and custer: dark brown, pin holes, undermelted
1:1:1 ash, blackbird clay, and soda ash: very nice - shiny, stringy
(like an ash glaze), runny, mahogany red.
I had one more test tile so in my quest for a metallic, dry, rust like
glaze, I threw together 1:1:1:1 red iron oxide, bone ash, ball clay, and
magnesium carb, and got a terrific rough lichen glaze, with small
irregular islands. Today I rubbed white glaze in between the cracks and
will refire to see what happens.
You can see pictures of these glazes at:
http://pg.photos.yahoo.com/ph/potterdc2001/album?.dir=/66d7
Jonathan in DC
waiting for the next winter storm!
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