mel jacobson on mon 3 jan 05
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.
bob anderson re/fired a large platter at the farm this fall
that was very brown. it became one of the most wonderful
pots we have ever taken from a kiln at the farm.
red/crystal/almost violet waves. nice piece.
ivor/i cannot technically answer your question.
but, i know for sure that reduction plays a very big
roll in the color of iron red. that is from years of
observation. as always, thickness is critical.
i have been using iron red for years...40 years before i met
joe koons. a few of my favorite pots that i have ever
made have iron red insides. alfred yellow outsides or a
rim of rob's green...and
the drip edge is marvelous where they meet.
mel
i had eggs this morning on my new plate/plates.
i am very happy with this set of dishes.
sharlene loves them.
i have yacked enough about this glaze test.
From:
Minnetonka, Minnesota, U.S.A.
web site: my.pclink.com/~melpots
or try: http://www.pclink.com/melpots
new/ http://www.rid-a-tick.com
Steve Irvine on mon 3 jan 05
Here is an iron red recipe that I've been using for some time. It seems to be a slight variation
on the one Mel has posted. It gives a nice orangey-red colour in cone 10 reduction, with a
smooth, functional surface. The bone ash I use is actually a bone ash substitute called
diabasic calcium phosphate. It seems to give a richer colour than the conventional bone ash.
NC4 soda spar 37.5
Whiting 5.8
Bone ash sub. 9.2
Silica 20.
EPK 5.8
Magnesium Carb 5.
Talc 6.6
Red Iron Ox. 10.
Steve Irvine
http://www.steveirvine.com
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