mel jacobson on fri 11 jul 03
one of my fondest memories of redart
clay was as a glaze, used on some
warren mackenzie pots in 1960.
`tomato red`.
he said he just mixed redart with silica and
whiting. or some such thing.
it was a wonderful glaze.
anybody willing to build that glaze?...you
will love it...and please share your
study with us.
mel
From:
Minnetonka, Minnesota, U.S.A.
web site: my.pclink.com/~melpots
or try: http://www.pclink.com/melpots
new/ http://www.TICK-ATTACK.COM
Harry Crackpotter on fri 11 jul 03
One of my favorite glazes is a fake ash glaze
60 % red art
40% whiting
cone 10 (though you could try other temps)
Simple, beads and runs wonderfully. I usally add a bit of cobalt to darken
the green some. Looks good on a dark or light body.
Harry Atlee grumpy still
John Britt on fri 11 jul 03
Mel,
This is a nice Kaki with Redart.
Plenty more like that in the Archives:
This from Hank in Eugene. (aka Reeves Mashiko, Memphis Mashiko, etc.
Fake Mashiko Kaki
Cone: 10
Kona F-4 Soda Feldspar 36.27
Bone Ash 0.35
Talc 4.10
Wollastonite 5.47
Calcined Red Art Clay 37.76
Red Art Clay 3.97
Silica 8.60
red iron oxide 3.48
Totals: 100.00 %
I am sure you will like it,
John
David Hendley on fri 11 jul 03
In the '70's John Glick developed several Redart-based slip-glazes.
Here are two that I still use. I don't know what his numbers and
letters mean.
CH-18A, cone 10
Dark Green Semi-matt
Redart clay 66.5
F-4 feldspar 9.5
whiting 19
EPK clay 5
This is a high calcium glaze which makes a durable glaze at cone 10,
with .52 MEs of alumina and 3.26 MEs of silica
CH-18C, cone 10
Tan Yellow Matt (tan where thin, yellow where thick)
Redart clay 54.5
spodumene 9.1
whiting 27.3
EPK clay 9.1
This is a low silica matt with .42 MEs of alumina and 2.24 MEs
of silica.
I use these glazes as slip-glazes and brush them on leather hard clay.
David Hendley
david@farmpots.com
http://www.farmpots.com
----- Original Message -----
> one of my fondest memories of redart
> clay was as a glaze, used on some
> warren mackenzie pots in 1960.
> `tomato red`.
>
> he said he just mixed redart with silica and
> whiting. or some such thing.
>
> it was a wonderful glaze.
>
> anybody willing to build that glaze?...you
> will love it...and please share your
> study with us.
Burness Speakman on sat 12 jul 03
What happens at cone six?
Tony Hansen on sat 12 jul 03
Making a glaze from Redart is dead easy using a chemistry
program like INSIGHT. Open an existing iron bearing glaze
in one recipe then put 50 parts redart into the other. Then
start adding things to the redart until the chemistries match
and then retotal to 100.
Redart is very good for this because it has low CaO and almost
all glazes have lots of CaO.
For cone 6 you need some Boron to get a good melt so you
can use a frit that has lot of CaO like 3134.
If you simply add whiting Redart starts looking like a normal
stoneware glaze by the time you get to 20 or 30%. Someone
else mentioned they have a glaze like this.
-------8<--------
What happens at cone six?
--------
Tony Hansen, Digitalfire Corp.
Ron Roy on tue 15 jul 03
Just in case anyone is interested - this glaze is very short of silica and
somewhat short of alumina so it would not be a suitable liner glaze - there
is noting much to worry about as far as toxicity - until you start adding
them - like cobalt.
On top of that the expansion is very high so its gonna craze on any pottery
clay that I know of.
RR
>One of my favorite glazes is a fake ash glaze
>
>60 % red art
>40% whiting
>cone 10 (though you could try other temps)
>
>Simple, beads and runs wonderfully. I usally add a bit of cobalt to darken
>the green some. Looks good on a dark or light body.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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