Imbolchottie@AOL.COM on sat 28 jun 03
I'll be glad to give you the recipe free in exchange for
a) Cleaning my house for the next quarter, (10 weeks)
b) Laundry every Friday nite for the next quarter. (see above)
c) Prepare enough frozen meals so I don't have to cook after a day of
teaching and a night of student-ing (sounds like a GWB word doesn't it?)
d) Clean the cat box once a day, so my senior cat, and his senior moments
don't spoil my day.
When it comes down to it - it's better to buy the book.
Going into the studio now to glaze the tiles for Spearmint and the High
Calcium Semimatte (colorants yet to be determined.) Boy that HCS settles fast!!!
Buy the book, stick to the list -- I've found Ron Roy very generous with his
time & patience.
By the way - we don't have a black stain in the school studio (CSLA) - can
anyone tell me which oxide is the black? I'm having a senior moment myself
trying to remember.
Firing tomorrow - oh boy oh boy oh boy oh boy oh boy!!!
Jonathan in LA with overcast mornings and sunny days, unable to do lunch w/
Vince. Didn't anyone warm him about the June Gloom of southern california????
iandol on sun 29 jun 03
Dear Jonathan,
The idea of a Black Stain is solved by using colour theory and selecting =
a series of metallic oxides which give complementary colours. Which =
means different mixtures are needed for differing kiln atmospheres and =
differing maturing temperatures. So no single recipe will provide a =
solution for every occasion.
I think this would be an ideal exercise for any class of students faced =
with the prospect of including Black in their repertoire of aesthetic =
tricks.
As the Gurus say "Test, Test, Test and Test again"
Best regards,
Ivor Lewis. Redhill, South Australia
Snail Scott on sun 29 jun 03
At 10:41 AM 6/28/03 EDT, you wrote:
>-can anyone tell me which oxide is the black?
You usually get a better black with a mixture of oxides.
Iron is cheap, so use some of that, but add a lot of
chrome, maybe some manganese, and spike it with a bit of
cobalt. Without the cobalt, you tend to get brownish
blacks. The exact proportion isn't critical, but Chappell
gives a few recipes:
64 Chrome oxide
36 Red Iron Oxide
OR
54 Chrome Oxide
26 Red Iron Oxide
15 Manganese Dioxide
5 Cobalt Oxide
That first recipe will almost certainly be a bit brown,
but easy and inexpensive. The second is likely to be
a truer black.
-Snail
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