jeremy Kaiser on fri 31 jan 03
Thanks for the advice richard, yesterday I came upon an interesting idea, i came up with mixture that might be similar to yours and gosu. here it is. It is measured in the 2:1:1 ratio system
Cobalt carbaonate 3
Manganese dioxide 1
Red iron oxide 1
Kaolin epk 2
This formed an interesting mixture that brushes on really well and add more kaolin to amake it better for washes. Any one have good advice on trimming, i'm redoing my mug assignment after having an incredibly good idea.
Jeremy Kaiser.
Richard Mahaffey wrote:Someone mentioned the Japanese style of cobalt called gosu.
Gosu is made from pebbles of cobalt ore containing some manganese. I
have been told that Gosu is hard to get or sometimes impossible to get
in Japan.
Bernard Leach in A Potter's book has a formula for "Chinese Cobalt".
It is:
Manganese oxide 40
Black Iron Oxide 30
Black Cobalt Oxide 20
Calcined Ochre 10
We use it at school on all of our glazes except the mattes and semi
matte glazes. For matte glazes we have had good success with mixing a
little of the glaze with the cobalt oxide to tone it down.
By having the students use Leach's Chinese cobalt you can see that we
save a lot on cobalt.
Rick Mahaffey
Tacoma Community College
Tacoma, Washington, USA
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