Dave Finkelnburg on mon 3 jan 05
red
To those who collect and use glaze recipes,
I have to make a few comments on Mel's generous sharing of his "kaki/persimmon/iron red" glaze today. First, reread the parts where Mel comments on application and firing atmosphere. This glaze will be HIGHLY variable depending on what clay body it's applied on, how thick it's applied, and the firing atmosphere in the kiln. This is not a cobalt blue. It will not give you the same color every gas kiln firing, no matter what. That's why I love iron reds! :-)
This glaze will, as Mel cautions, go brown with heavy reduction. You can also get black (even to the point of black metallic gloss), plum, red, iron blue, and even all of the above at the same time. The variation has to do with kiln atmosphere oxidizing or reducing the iron in the glaze. This is a wondeful glaze provided you value the variations you can get from it.
Also, this glaze will tend to run if overfired and applied thickly. It's not a runny glaze, but it can flow.
Good potting!
Dave Finkelnburg
mel jacobson wrote:
here is a copy of my favorite kaki/persimmon/iron red
glaze.
it came from susan karrasch, from ralph bacera at
the old parson's school in california.
(and, doug gray gave me one almost the same. so he gets
credit too.)
kaki is the word in japanese that means persimmon.
a deep red to orange fruit color.
it has become a standard group glaze at the farm.
both in stoneware and salt.
PERSIMMON NO 1
40 custer spar 8.8 pounds
21 silica/flint 4.6 "
6 epk 1.3 "
8 whiting 1.75 "
7 talc 1.5 "
10 bone ash 2.2 "
10 iron 2.2 " (makes 5 gallons)
(note pounds, i always measure that way. and the glaze
is perfect with the pound measure. the math may be fuzzy
but the results are perfect.) ( i have averages some
ingredients over the years.)
this glaze loves light reduction. hard/heavy reduction
leaves it very brown. i keep my kiln on about .05 on the
oxyprobe for this kind of firing.
i use this glaze with a rob's green rim. they work together
very well. (in fact, this is a great base glaze and accepts
many top layers of other glazes without problems...just don't
get carried away.
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