William Jacob on sun 9 mar 03
What does the green tea do that you can't acheive with water and gum arabic or some other thickener?
--- jeremy Kaiser wrote:
>Everyone on here, my blue an white pieces came out wonderful. Each one is nice and blue. Richard, my blue can become a transparent wash. Second i get a digital camera, will send out pictures on the list.
>My recipe goes like this for 20 grams of liquid
>10 grams cobalt carbonate
>4 grams red iron oxide
>4 grams manganese dioxide
>2 grams kaolin
>mix with green tea that has been allowed to sit until consistency of thin syrup, more or less green tea for washes or specific lines. this mixture makes for very nice blues and a variety just depending on how many layers you put on in the same area.
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terryh on tue 11 mar 03
William Jacob wrote "What does the green tea do that you can't=20
achieve with water and gum arabic or some other thickener?"
i don't know, and i don't know if Jeremy answered already.=20
but i noticed some people use greentea wash as in the following=20
Gosu (natural cobalt),=20
powdered natural cobalt is ground with a boiled=20
green-tea solution. The grinding is done with a=20
porcelain pestle on a frosted plate-glass slab.=20
The green-tea solution is made by boiling the tea=20
and then permitting it to set until it is the the=20
consistency of thin syrup.
When the gosu is mixed with just the right amount=20
of tea solution, the brush will move freely and=20
smoothly during painting. After the painting is=20
completed. the piece should dry for about half an=20
hour before it is ready to be glazed. The tannin=20
in the tea keeps the decoration from spreading=20
when the glaze is applied.=20
Gosu, which is an impure cobaltous pebble found=20
in some creek beds in the Orient, contains, in=20
addition to cobalt, manganese, and iron in=20
fairly high percentages.=20
The World of Japanese Ceramics, H. Sanders (1967)