Jocelyn McAuley on fri 4 may 01
Hi all,
I wanted to share some results I got two weeks ago (just in time to stick
in my crystal show!) involving reducing macro-crystalline pots
I've always drooled over the reduced copper red macro-crystalline pots in
my research notes, but I've been halted by not being able to reduce in th=
e
electric kilns here at school.
In one of Leon Bush's articles, he explicitly explains that he reduces th=
e
pots on the cooling cycle when they hit 1500 F, and stops his oil drip
method when they reach 1000 F. Using this as my guide, I took some
already crystal fired pieces (some still on their pedestals, so already
ground) and fired them in our Alpine kiln to cone 015 (no pyrometer).
My firing schedule was fast and ambitious: 1 inch turn ups on the half
hour, won't go beyond three inches of water though. With cone 015
slightly bent, I put the kiln into a mild reduction for 30 minutes, and
then turned off the gas. Half an hour later, I turned on the gas (lettin=
g
it self ignite- that's fun!) and reduced for ten more minutes.
My results out of the kiln were inspiring!
- Copper + cobalt glaze platter: gorgeous red crystals at rim that turn
into metallic silver/pewter in the center.
- 3% cobalt glazed bowl: crystals stayed blue, background turned to pale
pink/peach.
- 5% copper bowl: gorgeous pale yellow, creamy white background at top,
red toward bottom. Crystals are copper metalic color, halos that were
pure copper looking turned opaque white. A favorite.
- 3% copper vase: red/burgundy background, crystals remained green.
- 3% copper vase: a combination all over of both crystals and background
turning white, purple, peach, and light green. Kind of a Hawaiian shir=
t
color combo.
I was surprised at cobalt changing its color. I have more cobalt pots I
want to play with, as well as try some iron glazed ones.
Cheers!
Jocelyn
--
Jocelyn McAuley ><<'> jocie@worlddomination.net
Eugene, Oregon
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