Maid O'Mud on wed 19 nov 03
Probably a dumb question but...here goes....
Quite some time ago I bought out a small ceramic business. One of the =
bright yellow powders was labelled yellow ochre. Yesterday I got the =
bright idea to test it.
I mixed 5% into my white slip base and applied it today. Currently wet, =
it's screaming baby puke yellow. Anyone care to guess what it will look =
like fired to ^6 ox?
I know I'll find out next week when I fire, but til then I'm just
sam - curious in Melbourne.
Sam - Maid O'Mud Pottery
Melbourne, Ontario CANADA
=20
"First, the clay told me what to do.
Then, I told the clay what to do.
Now, we co-operate."
sam 1994
=20
http://www.ody.ca/~scuttell/
Mike Martino on thu 20 nov 03
Sorry, I don't remember the chemical breakdown, but yellow ochre has a ton
of iron. My guess is brown, black or thereabouts. In oxidation, it might end
up looking like a washed out matt brown/bronze color.
Mike
in Taku
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG]On Behalf Of Maid O'Mud
Sent: Thursday, November 20, 2003 12:19 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: yellow ochre?
Probably a dumb question but...here goes....
Quite some time ago I bought out a small ceramic business. One of the
bright yellow powders was labelled yellow ochre. Yesterday I got the bright
idea to test it.
I mixed 5% into my white slip base and applied it today. Currently wet,
it's screaming baby puke yellow. Anyone care to guess what it will look
like fired to ^6 ox?
I know I'll find out next week when I fire, but til then I'm just
sam - curious in Melbourne.
Sam - Maid O'Mud Pottery
Melbourne, Ontario CANADA
"First, the clay told me what to do.
Then, I told the clay what to do.
Now, we co-operate."
sam 1994
http://www.ody.ca/~scuttell/
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Alisa Clausen on thu 20 nov 03
Dear Sam,
Yellow Ochre is an iron ore. It produces yellow to brown colors. It is can
be used like a stain, around 10-12% gives notable color response in glazes.
I use it often in both slips and matte glazes because I like the color and
it is cheap, free, scraped from the rocks on the beach where the springs
run off.
In oxidation firings, the yellows are best obtained in high calcium matte
glazes. In high silica glazes, the ochre becomes darker and brown. To find
out more about this reaction, read Hamer and Hamer on the subject of
Dolomite and also Ochre.
You can see the results of at least one glaze I color with yellow ochre at
www.alisa-potshop.dk on the gallery of glazes side. The glaze is WoDo
white, a Dolomite white matte and the ochre gives the glaze streaking and
many nuances.
regards from Alisa in Denmark
Liz Willoughby on thu 20 nov 03
Hi Sam,
When I was firing oxidation C/9 many years ago, I used to add (I
think), 2 % yellow ochre to a opacified glaze to achieve a light warm
yellow. So I imagine that yours will be darker in the slip.
Liz from Grafton
>
>I mixed 5% into my white slip base and applied it today. Currently
>wet, it's screaming baby puke yellow. Anyone care to guess what it
>will look like fired to ^6 ox?
>
>I know I'll find out next week when I fire, but til then I'm just
>
>sam - curious in Melbourne.
--
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