(2005 March 15)
This little covered jar was fired to cone 9 in reduction. It is about 4.5 or 5" across, and not quite as tall as it is wide. The glaze contains 6.5% RIO and 4% Ceramic Rutile. The effect is vaguely similar to “hare’s fur”, but has its own character, which I rather like. It works moderately well in oxidation, but wants a soak to let the pinholes even out. In reduction, however, it is generally well behaved, as you can see. (I should point out that I sprayed the glaze onto this piece, in order to get a reasonably even coating thickness.)
(As usual, click either of the small images to get a larger version.)
For those who care: I ordinarily start mild reduction
around 750° Celsius, and continue until
approximately cone 6, basically the point at which the
glaze has skinned over and further reduction becomes
largely pointless (about 1220° C). I then reduce the
gas flow until the flame is more or less neutral, and I
keep it that way until the end of the firing, which is
ordinarily at cone 10. (My test kiln is very small, and
it heats up extremely rapidly; cone 10 is just shy of
1300° Celsius in most of my firings.) When I turn
off the gas it takes me a few seconds to move the burner
a forced-air design
that I came up with in the process of converting the
kiln from electric to gas) away from the inlet port, and
during that time the kiln fills with air. This gives me
a period of fairly strong oxidation just at and after
peak temperature. Some glazes, for example Copper Reds,
are noticeably brighter if you treat them that way.
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Last modified: Tue May 9 11:34:25 EDT 2017